Hi, I currently have a asus p5wd2 premium http://uk.asus.com/Motherboards/Intel_Socket_775/P5WD2_... motherboard and I am not looking for an upgrade for that because it's expensive. The main reason I'm here is because I want to know my choice in parts will be stable and compatible:
Cooler Master Hyper 212 Evo
Asus nVIDIA 3D GeForce GTX 550 TI
G.Skill Ripjaws - Memory - 8 GB : 2 x 4 GB - DIMM 240-pin - DDR3
Arctic Cooling MX-2 4g High Performance Thermal Compound
Alpine 650W Quiet Silent PC Power Supply PSU 120mm Fan
Also if you have any suggestions on what else I should buy instead I will be very grateful. Also I am looking to run games such as Minecraft, Battlefield 3, Arma II DayZ.
Weak link here - your PSU choice, not the place to go cheap. For a single GTX 550ti, no more than 500W is needed. Select a PSU from a reputable manufacturer such as Corsair, XFX, SeaSonic, Super Flower, Antec (I have never heard of Alpine, nor have I seen any reviews of their units from legitimate sources) or find a review from such sites as JonnyGuru, HardOCP, AnandTech or HardwareSecrets - all of those sites do extensive testing of the PSU's and even take them apart to look at the quality of the parts and the quality of assembly - don't have to read the whole articles, simply go to the conclusion pages.
The only other concern is that the CM Hyper212 EVO is a large cooler, make sure it will fit your case.
Not bad though