Hi Julio!
You mentioned a needed cargo capacity of...
Weight capacity : 150 kg (cyclist included off course)
This is an important point...the combined weight of yourself and the bike plus cargo can help determine which model you choose as best suited to your needs.
For comparison...
In my case, though I weigh 78kg, I do extended, self-supported desert touring in summer season, so I must have enough capacity to allow for not only my weight and my normal touring load, but also so I can occasionally carry as much as 26liters (=26kg) of water plus food. The result is, I needed a bicycle that can carry a heavy load on occasion, so the Nomad Mk2 has been a good choice that handles the extra weight well.
It has been a great all-'round bicycle and I often use it like a mountain bike to ride unladen or lightly laden on very rough logging roads or cross-country. As one might expect, a bicycle made sturdy enough to carry such heavy loads can have a harsh ride when ridden without a load on rough surfaces. I addressed his problem by substituting a Thudbuster LT (Long Travel suspension seatpost for the original rigid seatpost and have been completely happy; the bike remains as sturdy as ever, but is now comfortable regardless of terrain or load. Fortunately, the Nomad's sloping top tube allowed enough clearance for me to use the Long Travel version of the Thudbuster. I have the Short Travel version on my road bikes, and while it is nice and helpful, I needed the extra travel of the LT version where I use the Nomad.
I am fortunate to have a number of bikes to choose from, so there is usually one ideally suited to my needs. My preferred bike for 300-400km day rides is a derailleur bike that is a 32 year-old randonneur that is similar to a Thorn Club Tour with perhaps a little of Thorn Audax mixed in. I can also tour on it on gravel roads. It weighs 14.5kg. With my weight, it is most comfortable carrying about 17.5kg, and has a hard limit of 25.4kg. Total maximum combined weight for this bike is 78kg (me) + 14.5kg (bike) + 25.4kg = 117.9kg.
In contrast, the Nomad weighs 20kg dry (as I have it configured) and has carried 52kg (the same 25.4 as the rando/touring bike's hard maximum + 26l/26kg of water plus a bit more food), plus my own 78kg. Yes, my Nomad weighs as much as my tandem, but is also sturdy, which is what I most desired. I have come to value highly its steeply sloped top tube when dismounting in rough terrain; the extra standover clearance is really nice. Total maximum combined weight for this bike is 78kg (me) + 20kg (bike) + 25.4kg (cargo) + 26kg (water) = 149.4kg, very close to your stated 150kg.
In comparison...
In Summer 2014, one of our Forum members kindly loaned me his Thorn Raven Tour for a four-month double-crossing of Eastern and Western Europe. It rode much like my previous Thorn Sherpa...much sturdier than my rando-tourer, but not as capable with large loads as my Nomad. Unlike my desert and wilderness tours here in America, I was near stores for food resupply, and carried at most a couple day's supply with me and generally much less water. I didn't have scale with me while touring, but my impression is I was at times near its comfortable handling limit when I added 8l of water to my regular touring load (as I needed to coming and going through Serbia, when air temperatures reached 45.5°C during a heat wave and I drank a lot of water and needed a bit more in camp to prepare my meals). The Raven Tour proved to be the ideal bike for that adventure, sturdy for use on the extremely rough roads of Eastern Europe while being comfortable to use with a rigid seatpost. It would not have been as ideal as the Nomad for my expedition use here in the States. For that, I really needed the sturdier bike capable of hauling more weight, primarily in extra water and food. However, the Raven Tour would still be a great rough-service tourer for less extreme loads, and I'd like to have one. I think the newer Raven might be just a touch light for my cargo-carrying needs, but would surely ride superbly.
All this is to say combined rider weight or rider weight plus cargo weight can help determine which frame is best for you and your needs. I am particularly sensitive to this issue because several of my touring friends are large people and I have helped them by building wheels for their needs and figuring what will work best. For example, my tandem had been owned by a pair who each weighed 170kg (plus the 20kg bike), and a close friend in Germany tips the scales at about the same and is very tall. He builds his 700C wheels with spokes intended for German Postal bikes and they do remarkably well when a touring load is added. He has come up with some workable solutions, but his aluminum frame has proven to be seriously overloaded and he recently opted for a truss-framed steel bike to address his needs.
In his Nomad brochure, Andy Blance has mentioned selling frames to larger riders, and he seems well experienced in meeting their needs. I worked with him directly in spec'ing my Nomad and I could not have hoped for a nicer experience. Though we differed in our preferred configurations, he was respectful and helpful in every way toward meeting my needs and was a real pleasure to deal with. It's worth a call or email to Thorn to seek their further input, Julio.
Also, if you prefer drop handlebars instead of straight handlebars, you will require a frame with a shorter top tube, and this can affect overall load capacity.
All the best,
Dan.