Hi there Smudge. I haven't actually bought a boat yet, and although I've read endlessly, particularly on these forums, I've only been to see one boat and rejected it because there seemed to be some mysteries surrounding the ownership of it. Also, the seller seemed to have assumed that I'm a bit stupid and tried to tell me several things about boats that were untrue, eg that you would rarely get a proper cooker with a 40 foot boat.
There's no substitute for finding out as much as you can before you view, by reading the topics here and asking questions if you need to. After that, I think you need to go and view some. Perhaps you could draw up a checklist of what you want - maybe 'I must have this' and 'I'd like this but it's not vital'? The key thing is a sound hull, so you'd have to have a hull survey at least.
I can't really advise you, because I'm just a novice! I'm happy to share ideas though. At the moment I've gone into a bit of a catatonic state about the whole buying process, and might just leave it until the spring, unless I see something I really want.
Eloise