Much obliged.
I'm an Intel fanboy, so...
E4500 through E4700 should be within that price range. I just grabbed a 4500 the other day and all I can say is "WOW!". 2.2 Gh stock and can easily handle an OC to 3.0 from what I've read. It's handled everything I've thrown at it without breaking a sweat so far. You might be able to find a slightly better one that falls within that range if it's on sale or you order online and get free shipping.
I'm not even going to pretend I know enough about AMD to make suggestions