I have a Bear Instinct that I bought in 2004 I believe. I spent around $400 for it from Bass Pro. Great bow for the money. I have the 60#limbs cranked down and should be somewhere in the neighborhood of 280-290 fps if my string hasn't stretched too much. Some of the newer Bear models are more expensive but are nice bows, but there are still some around the $400 mark that should be a good place to start.
Get measured for draw length, and pull a few different weights to see if you'll need to 60 or 70# limbs.