Hi. I just bought an Ivy Bridge i5-3570K barebone kit along with a 550Ti, but don't find it to be an especially impressive performer for my various flight and train sims. So, I am wondering what you think would be best for DX9 (and OpenGL) gaming, the GTX 280 or GTX 550Ti. Tigerdirect has a good deal on refurbished 280s, though I'd need to buy a new PSU since the barebones cames with a 650W. I run XP 64 and XP 32/SP3 and doubt I'm going to be running anything in the future that requires DX10/11.