Any problems?

Well, I'm totally inexperienced in regard to building computers, and this is my first ever build, so I'd appreciate any help.

I basically want to make sure that there aren't any glaring problems like components being incompatible, and ensure that I'm not spending twice as much as I need to for the same performance.

So far I've decided on:

Sapphire HD 5770
Intel Core i5 750
Artic Cooler Freezer Xtreme Revision 2
Gigabyte GA-P55-US3L
Corsair 650W TX series
Seagate ST3500418AS 500gb
Crucial 4GB DDR3 1333MHz/PC3-10600 Memory Kit CL9 1.5V
Sony AD5240S
Xilence Red Wing 120mm
NZXT ALPHA case

Any help or pointing out incompatibilities would be greatly appreciated.