Pinkbike is a great place to find a deal
also does your work do a cycle to work program??? if so its an easy way to get hold of a great bike for a lot less £££ and its easier on the pocket. As for buying a frame and possibly forks, not to knock the idea because quite a lot of people do this, ive read quite a few threads and listened to people and it can work out more costly over all. As i said before its all down to personal taste & cash
Go to a few shops, sit on a few bikes, and get a feel for the frame style. "but" IMHO a AM bike is a really good choice, unless FR/DH is more your cup of tea....... then a whole new mine field is open!!!
Plenty of people on here will give advice!!!!
ive given mine
MuZzA