Just to add another name to the list thats not been mentioned before, and because i have got one!! Ribtec 655, very good but hard to get. I would recommend this boat to you as i had much the same needs as you and this has more than done the job so far.
What i would warn about is any of the Camel Ribtecs, due to the beating they have all had and the work they will require in the future.
If you like, go and have a look at mine at www.rib-hopper.co.uk
and if you would like to go out for a spin from Lymington sometime give me a bell.