I went in on the Dell deal for the Radeon 8500. I need it for a system I built. Right now I am stuck using an old Diamond Stealth 3 S540 16MB. I'm wondering if I should cancel the order with Dell and just get an OEM Radeon 8500 from NewEgg? Assuming I would get one of the 250/250 ones, how much difference does that make compared to the 275/275? How would that compare to a Radeon 64MB DDR VIVO? Thanks for any info.