Rib International have a test on: reading room under
http://www.ribmagazine.com/index.htm
My previous boat was a 12 year old Avon Searider: the build quality is excellect . I considered the 6.2 myself, though decided on a Redbay 6.1 as my boat is mainly used around Jura/Islay/Mull of Kintyre and I felt the Redbay had a better hull design for waves in this area and a far better console with jockey seating for 4/6 (see photo).
I also went for the Yamaha F115: excellent engine, quiet and economical and negligible effect on top speed compared to a friend with a similar boat and a Suzuki 140.
Good luck.