The boats are all pretty equal. Main difference is the 2008 had a new rudder system. I'll check local and see if any are available. Also the classifieds here or Jeremy at Surf City Catamarans can usually find a boat. Also the Hobie forums sometimes has used boats.

New Tigers are around $17,500 (est)
Used with STX sails are about $9000
If you want the newest and latest
The Wild Cat is about $22,500 (est) no real class yet other than F-18.