totally get the 5750, i just exchanged a 5670 for it today because the 5670 was louder then all the fans in my system. if i lowered the fan speed then the card will start to get really hot and not work properly(it totally froze on medieval: total war 2). but if your on a budget then the 5670 is good at the res. the 5750's fan noise is not that noticable at the preset speed.i tried operation flashpoint: dagon rising on it at 1680x1050 and it ran as smooth as butter maxed out.
by the way both cards were XFX cards so idk if the same deal i had with mine will apply to cards from other manufacturers