i definitly cant reccomend these Fostex PM-2's enough.. they were about 450 and sound top notch for that price. They compare favourably to my last PMC monitors in all but stereo imaging (but they still have better stereo than most at this price range) and sound way more defined on the top than my KRK K-ROKS did.
Small monitors wise if you hunt around you may be able to fine some second hand Mackie 626's at somewhere around your budget - which would also be a wise choice in my opinion..