CPU+ Mobo: ASROCK H81M-HDS + i5 4460 (329)
RAM: CRUCIAL PC 12800/1600MHZ DDR3 CL11 VALUE RAM (8GB) (99)
GPU: ZOTAC GTX750 TI 2GB (219)
SSD: CRUCIAL M550 128GB (86)
HDD: TOSHIBA 1TB 7200RPM (69)
DVD-RW: LG 24X DVD-RW SATA OEM (25)
PSU: FSP AURUM S 500W (89)
Case: DEEPCOOL TESSERACT (65)
Total cost: $981
Buy at PC Themes, #04-15, and ask for discounts. DIY yourself. If you can't into DIY, get PC Themes to assemble for you for a fee.
Notes:
1) Unfortunately, the GTX 760 is way out of the budget, so can only put in an i5 at best and use the rest of the $$$ to get a better quality PSU. Would suggest that you save up and get a better GPU in the future when you want to play Evolve.
2) This rig at its current state should be capable of playing Evolve at Medium settings in 1080p. No guarantees as Evolve is still unreleased.
Can also play most MMORPGs at max settings easily as most MMORPGs tends to be easy on the CPU and GPU to allow people to have a playable gaming experience even if they are using a potato for a rig. However, some GPU demanding MMORPGs like Archage may require you to dial down your graphic settings down to Medium when playing these games. Hope you don't mind.
3) Interestingly, on PC Theme's pricelist, they have the Zotac GTX 660 listed in it for $189. I did not include in the build as I am not very sure if they actually have this GPU in stock or not.
Do note that if they really have this GPU in stock, it is actually a very good bargain as the GTX 660 is a more powerful GPU than the GTX 750Ti and will allow you to theoretically play Evolve at Medium-High settings. Can ask them, but don't expect too much though.