I´m in the proces of building a new computer, since my old one can´t keep up anymore. I have had good expirience with an AMD system so far, and the new build will also have to be an AMD system.
APPROXIMATE PURCHASE DATE: Within the next 3 month
BUDGET RANGE: $1200 - $1500
SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: photo editing, surfing the internet, gaming
PARTS NOT REQUIRED: Keyboard, mouse, monitor, speakers, DVD burner (NEC), Systemdrive (36,6 GB Raptor)
PREFERRED WEBSITE(S) FOR PARTS: Normaly use www.edbpriser.dk but it´s in danish so feel free to use newegg
An ATI 4870 should be able to run most games on high/very high settings at that resolution.
If your planning to add a second graphics card in the future, you might want to bump up the PSU to 750W or if you're sticking to just a single graphics card then a decent 600W will do.
For the HDD, a Samsung Spinpoint would be faster and it's normally cheaper. Don't know how it's priced in Denmark though.