Google "Star Rafts" some ok reviews, some not so good reviews (boats are made off shore)...
I used to be a ww rafting guide for the university I attended in Idaho and your get what you pay for, that's for sure.. I wouldn't consider anything that wasn't a 12' - 14' self bailer!!
Aire, Maravia, Hyside and on the (slightly) lower end NRS are all good rafts! Aire has a great deal on their 12' Tribs (on their specials page) $2000 (Tribs are their "off shore" version), plus about $500 for a fishing frame! Buying new you get a very good (5 year warrantee for the Trib, 10 year on the Aire - Aire makes all the Outcast boats). PVC has it's advantages (weight saving and slick & smooth), but so does Hypalon (very strong but heavy). The only complication is you would have to drive down to Idaho or have it sent up which make it a tad bit more expensive. If you are interested in a raft, I think Kimball Sports out of Cardston sell off their previous years boats (PM to Kip - Fishguide76 on the board). Or if you have any specifics for me I can try to help.
Cheers
Peter
*Edit* I should answer your original question... A decent ww raft/fishing raft capacity should be 1000 - 1500 lbs 12' - 14' (or so) respectively depending on the quality.