Ni Nick, and welcome! We'll look forward to your stories as you get to know your Raven, and I'm sure you'll find the Forumistas an informed, knowledgeable and congenial lot.
A few thoughts on your question of getting the right size for your Raven. I've had a 565S Raven since the spring of 2014, the 'S' because I have drop bars on my bike. We seem to have similar sizes -- I have a long torso and arms, and shortish legs (a 30" inseam).
> As folks have suggested, do take advantage of Thorn's very good warranty service, and check out the 530L Raven. When I visited SJSC in the spring of 2013 (while I was researching my options), I tried both the 565 and 530 frames for size, and I felt as if I was perched up high on the smaller frame. Emphasis on "felt" -- in these areas, how you feel about things is critical, not just the measurements.
> That said, these are my measurements:
* My Raven's mid-point standover height is 810 mm. The bike has Mavic XM719 rims, and Schwalbe 26 x 1.6 Marathon Supreme tires.
* The standover measurement I gave to SJSC, when I ordered my frame, was 825 mm. However, my other touring bike (with 700c wheels) has a standover height of of 830 mm (measurement error?).
* Riding, I've never had a problem with clearance on either bike, and the Raven is especially roomy.
> So, do take the time to get the frame that feels best for you. I've been very pleased with my Raven. I use it for day rides, and have done a few tours on it through gentle and demanding terrain, camping and (less frequently) B&B-ing, from 3 days to three weeks. it's done everything I've asked of it, and it's a very comfortable bike to ride.
Hope this is helpful, Nick. Good luck, and enjoy! - John
PS: My Raven is matte black, and my Rohloff and SON28 hubs ditto. My Hebie chainglider is black, and I strive to keep it looking grimy. Of course I prefer shiny Italian red paint, but even more I prefer not to draw attention to my bike, the idea being that casual thieves will see that it has no derailleur, so must be a boring old NoName single-speed. So far, it's drawn little attention: only a couple of other cyclists, drawing up alongside on their trick plastic bikes, have asked about the Rohloff and my touring experience.