Thanks guys. I ended up buying 5770 and CoolMaster 600 watt. I love it.
another question since i don't want to start a new thread, On my Acer e380, i have AMD athlon 64 Dual core processor 4800+ 2.5 Ghz. can i just take it out and replace it with phenom http://www.newegg.com/Product/Product.aspx?Item=N82E16819103727
right away without any problems since my motherboard supports AMD?