and budget is about $100-200
1680x1050 is what I use.
Video card...based on your rig, you could do well with a ATI 4850/4870 or a GTX 260. They're last generation, but they still work REALLY well. Better bang for the buck in my opinion. You can also check out the "Best Graphics Card for the Money" articles on this site. They rarely stear you wrong.
PSU...I like Antec and Seasonic. I usually try to stick to anything that says "80 Plus".