Keep with the PC Power AFAIK they are pretty much the best at that price range.
Love the choice of GFX card, the 4870 offers very good price/$ ratio.
Not sure about the RAM though, I havent read/heard anything that suggests 1066MHz DDR2 is better than 800MHz OCed, but its a pretty good price anyway.
Personally I am a fan of the Antec 900, especially the bottom mount PSU and 20 CM top fan. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
The only downside is no dust filters, I suppose you could always get some, but they hinder airflow. Personally I dont mind cleaning the case every 6 months or so.