I would have a look at Braunston Marina if poss as we bought our first boat off them in December.
We originally had a budget of between 25-30k and looked at lots of boats and lots of rubbish both private and from boat dealers. We didnt like some of the dealers as we felt they were just trying to sell us a boat but Braunston were very clued up about each boat.
We found one 58ft 2004 that was £34,950 that had just been reduced from £39,000. It was everything we wanted apart from the bedroom having two fixed bunks, which is probably what stopped a few others from buying it.
We offered £30,000 and it was ours. So haggle haggle haggle, we are in a recession at the end of the day.
I have changed the bunks into a nice double, which didnt even cost me in materials as i used all the wood that was there.It took me a day and is now the perfect boat for us.
Good luck