Hoyt Ultrasport. Parker makes a few good mid priced bows as well. There are actually quite a few good bows out for around 400-500 dollars. Check PSE, Darton, Reflex, Bowtech, Diamond, Hoyt, Martin and some others.
Paul
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I didn't climb to the top of the food chain to eat carrots! (Ron White)
I would start by checking out the Diamond line but there are really alot of nice mid priced bows out there and I would encourage you to try them all.
Diamond
Reflex
Parker
Fred Bear (Buckmasters)
Ben Pearson
PSE
Also Cabelas and Bass Pro Shops have there own line that are manufactured by some of the name brand companys. I have no experience w/ any of their bows but I would leave no rock unturned when trying out new bows.