First time building a computer, so I'm looking for a little assistance. I've been out of the loop for a couple of years, so I know nothing now

I've only purchased Dells in the past
I just want to see that all my components are compatible. I don't want to spend any more, but if $20 gives me a great upgrade, any suggestions would be great.
This is my build:
http://secure.newegg.ca/WishList/Pub...Number=9008989
I'm building a PC based on this:
http://www.maximumpc.com/slide/build_647_gaming_pc
Thanks