Building a Desktop-PC

Hello, I am getting ready to purchase a few items to build a desktop and would like to know if these parts would be compatible!

Mother board:
ASUS M4A78LT-M AM3 AMD 760G HDMI Micro ATX AMD Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131672

CPU:
AMD Athlon II X3 455 Rana
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103911

RAM/Memory:
G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231275

PSU:
LOGISYS Computer PS480X2 480W ATX12V
http://www.newegg.com/Product/Product.aspx?Item=N82E16817170024


Also, a few other questions.

What size tower would i need?
Is the power supply too high or too low?
Is this going to be fast enough to play games online?
Which 1gb graphics card would be best under 100$?

Thank you for your help!

What is your budget?

Mid-tower would suffice.

Power rating for the PSU is fine, I would just recommend a Corsair or Seasonic. Much better quality, and that's the one thing you don't want to try and save money on.

What sort of games are you wanting to play?

Radeon 5670 would do pretty well for < $100

Hello guys! and thank you for responding so quickly.

I want to play a few games like Battlefield 3, and simple games on Steam.

I'll go for the Corsair!

(my budget is around 350-400)