The lower the resolution the easier it is to max out games with the same gpu. And it is very hard to suggest a build with no budget. Take a few minutes and fill out this. If you have no budget, at least give us an approximate amount you are willing to spend. And if you do not know your resolution what size is your monitor or do you plan on buying a new one?
To help you with some brand preference and parts and all generally with AMD/ATI you are getting more for your money. Proximon has a great guide on parts, take a look at this:
http://www.tomshardware.com/forum/257075-31-guide-choosing-parts
Anyway please fill this out: Just copy and paste it into your reply and fill it in.
APPROXIMATE PURCHASE DATE: (example: tomorrow -- the closer the better) BUDGET RANGE: (example: US$500-750)
SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: (example: Folding@Home, gaming, surfing the internet, watching movies)
PARTS NOT REQUIRED: (examples: keyboard, mouse, monitor, speakers, OS) **Include Power Supply Make & Model If Re-using**
PREFERRED WEBSITE(S) FOR PARTS: (examples: newegg.com, ncix.com, ebuyer.com -- this is to help others see available options and prices)
PARTS PREFERENCES: by brand or type (example: I would like to use an AMD CPU & Biostar mobo with a 24" LCD and full tower case)
OVERCLOCKING: Yes / No / Maybe SLI OR CROSSFIRE: Yes / No / Maybe
MONITOR RESOLUTION: (examples: 1024x768, 1280x1024, 1440x900, 1600x1200, 1680x1050, 1920x1080, 1920x1200)
ADDITIONAL COMMENTS: (examples: Need to have a window and lots of bling, I would like a quiet PC)