i want to build a gaming rig that can run all games including crysis,crysis 2,gta iv and all modern games on max settings +aa
on my 17 inch monitor (res:1280x1024) for 1 or 2 years
my budget is 500 dollars and I am confused what to buy but here is what I consider buying
cpu: phenom 2 955 or i3 2100
Gpu: radeon 6850 or gtx 560 ti or radeon 5770
mobo: help me about it
ram: 4gb ddr3
I want it just for gaming
hehe.. well I would pretty much use that as a guide, and then adjust it up or down according to your taste/availability of the components. are you in the US? I can't really speak as to the cheapest retailers to visit outside of Australia. But most of the stuff on the tom's guide build should be available from big e-tailers like newegg.com
But here is a build a bit more specific to your needs (i.e. minus case, and lower hdd size).
With in your budget the build that Curryj02 has put together is really about the best that you are going to be able to get. The Intel® Core™ i3-2100 is a very good processor that will allow to upgrade in the future to other processor in the 2nd generation Intel Core processor family.
No on the MSI H67 motherboard in my opinion. it is a different chipset which only really has the advantage of utilizing the integrated graphics of the CPU (which you won't need because you will be using the discrete gfx card for gaming). the asus P67 will let you overclock in the future if you ever wanted to.