Everyone has personal preferences. I've used these two; they're okay for the price.
http://www.sweetwater.com/store/detail/LSR2325P/ -$200 each
http://www.sweetwater.com/store/detail/M1ActiveMkII/ -$300 pair
A lot of professional video editing suites use the Blue Sky MediaDesk series (
very nice), and I've heard really good things about the eXo2 but never listened to them personally.
http://www.sweetwater.com/store/detail/eXo2/ -$450 for everything.
A lot of folks like the KRK speakers, but they made my ears tired (ear fatigue) fairly quickly; not good if you are working 8 to 12 hour days.
http://www.sweetwater.com/store/detail/Rokit6G2/ -$200 each
I own the Mackie HR824 and like them a lot, but they're out of your price range ($1,350 pair). I also like the Genelec 8030a, also out of your price range ($1,500 pair).
If you're near a music store take a few CDs of music you like, and with which you are very familiar (I doubt they'll have a DVD player hooked up...), and try out some speakers. Make sure that you tell the salesman to shut the f-bomb up so you can actually listen. Make your own decision, not what they are pushing. Some places will rent you speakers and apply some or all of the rental to your purchase.
You will also want to treat your listening environment, but that's a whole different story...