I was thinking of replacing my gpu with some new stuff able to run games with some mid - high eye candy enabled. (My budget is around 150 to 170 $).
Any advice would be appreciated.
My system specs:
Motherboard: Foxconn H55MX-S LGA 1556
CPU: Intel Core i3 540 @ 3.07 ghz
RAM: 2x 4gb Kingston DDR3
GPU: XFX ATi Radeon HD 4850 1gb DDR3
PSU: Coolermaster 550w Xtreme Power Plus
HDD: 1x Western Digital WD5000aaks 500gb SATA-II
OS: Windows 7 x64 SP1
Screen: LG FLATRON W2243S.
More abouthelp replacing 4850
A GTX 460 768 would be the way to go as it's a substantial improvement over your current 4850. Overclocking it will all give you some smoother frame rates as you start turning up the detail. Even so, you may want to spend a little more on a 6850 or 460 1GB.
By the way, stay away from the 460 SE 1GB. It's considerably slower than the regular 460 1GB.