Your Raven will have a powder coat finish, rather than enamel paint, although not perfect it is a lot tougher, the difference has become more noticeable since they removed the harmful chemicals from modern paints. A modern enamel will look good, but will also be the most fragile, that's OK if you bikes live the sort of pampered life, if they get a bit of abuse, I'd stay clear of enamel which is what the two you mention do. Looking almost as good as a top enamel job (And IMO better than the majority of them) are the polyurethane paints, this is what the Imron on the current Thorn frames is (Apparently also on most trains!). As well as looking good it's almost as tough as powder coat. You might have to search around for frame painters offering this, there are a few. Lastly there's powder coat - there's one near me that are not bike specialists but do a reasonable job, several local CTC members have used them, £50 if it's a colour in stock and £70 if they have to get it in. Bike specialists, of which there are a few, are likely to charge twice that but you have the reassurance that they know what they're doing.
Threads - depends on the finisher and their processes, you have to have a clear discussion with them, though obviously a bike specialist will know what's required. It isn't unusual to need a tap through the threads to clean them up, a bike shop will do this for you, if you don't want to do it yourself.
decals - paint sprayers will be able to source them, powder coaters are reluctant to cover them, something to do with the temperature you normally bake powder coat on (The clear coat is also powder.
My folder is looking tatty and I may get it powder coated this winter, if so it'll be posted down to Kent for Aurum Finishing to do, they don't have much of a web presence, but I've read plenty of positive reviews and seen a couple of good looking results.
