*A New Cheap Gaming Build -Need Input- *

Hey guys,

This is my first time building a computer. I want to know if all parts are compatible. I would also like to know if there is anything you think I could change to make it batter or more efficient if I am bottlenecking anywhere. I know it will not be a great gaming pc but i hope it will do the job. I would like to spend around around $700 (the cheaper the better without losing any performance). It will be used for casual gaming (Minecraft, Left 4 Dead 2, Team Fortress 2, torchlight 2 when it arrives, Etc.). Also surfing the web streaming movies and overall work like word. Please Please Please give me your ideas and if there is anything horrible wrong, I am open to criticism and a pat on the back if the scenario deserves. I would like to order all of the components from Newegg  
Thank you all who read all of this in advance!!!!!!  


Here is my list of possible parts . . . . .


Motherboard- ASRock: 970 Extreme3



Processor- AMD: Phenom ii x2 560 BE (hoping to unlock the full four cores with my mobo). What is the difference in performance in Athlon x3?



Memory- G.Skill: NS 4GB (2 x 2GB)



Hard Drive- Seagate: Spinpoint 500 GB



Video Card- EVGA: GeForce GTX 550 TI or ASUS: Radeon HD7750 (whichever has the better bang for the buck)



Power Supply- Cooler Master: GX 450w I would also like to know if a 380w will be able to power all of what I need



Monitor- ACER: S200HLAbd the resolution is 1600x900 and will that res. be able to run most games well



Case- NZXT: Gamma also I would like to add an extra 120mm in the front to pull air in