Some people like the more expensive ones for the warranty. I don't care to much if my card dies, it gives me the excuse to upgrade. If my 5750 kicks the bucket tomorrow, I'll limp along on my old x1800xt until I find a new card. Really not a problem.
There are exceptions to this rule and Powercolor is one of the few I'd avoid -- due to personal experience with problems and customer support (and the number of complaints they receive for both!) --- however if using that logic why not the HIS unit for $99 after MIR instead ?
wuups; too late; maybe cause it was 3am, maybe i broke under the stress of debating or perhaps blind chance stepped; at any rate, i went with the xfx card. yup, it's a done deed; thanks for two great options.