I have a good one for sale for about £4500. No living, but has a separate storage area that is quite large. It's Equitrek.
It depends how much you want to spend really... different makes will cost different amounts. You might go for an Ifor and one of the same age as mine (2 and a half years old) would cost less...
also bear in mind weights for towing if its a trailer, 2 17er's may well be over the towing vehicals capacity & VOSA are hot on random stop checks at moment (we got stopped a few weeks back) its not worth the cost if you are over.