Hmmm.... I'm not that aware of the prices on the American/Canadian market, since I don't live in those parts! However, I'll give you a few examples of acceptable monitors for the purpose specified!
For a gaming monitor, you need to be particularly aware of the following:
The monitors refresh rate: The Lower the better (I would say max 8-12ms for a gaming Monitor)
The monitors contrast ratio: This is important if you want the best viewing experience from your movies and games. The larger the color contrast, the better (Atleast 700:1 for a gaming monitor at that price range)
The monitors brigthness: Also an important feature. Would recommend 300cd/m^2 or higher
The monitors video bandwidth: Somewhere around 150mhz and above should be acceptable.
Here are a few examples, however do note that when buying a monitor you'll also need to buy an external TV tuner for it. You could possibly set your PC up as a Media Center, or simply buy a TV Tuner box in order to watch TV on it. Also be sure that your Graphics Card is capable of handling the Native resolution of the monitor you want to aqquire!http://www.benq.com/products/LCD/?product=838&page=specifications
Price here in Denmark is about 336,86 $ (including the 25% VAT we pay here)http://www.asus.com/products.aspxl1=10&l2=89&l3=362&l4=0&model=1741&modelmenu=2
Price here in Denmark is about 331,37 $ (including the 25% VAT)http://www.samsung.com/us/consumer/detail/spec.do?group=computersperipherals&type=monitors&subtype=lcd&model_cd=LS22PEBSFV/XAA&fullspec=F
Price here in Denmark is about 401,57 $ (including the 25% VAT)
My personal favorite is the Samsung one [Last one], definately well worth the money, despite it being slightly more expensive compared to the other two!
Hope this cleared up a few things for you!
NOTE: Of course you could always buy this one, once it comes out https://www.youtube.com/watch?v=2yT6OuGXmGo