S!
Osprey, the 4890 was/is one noisy card and runs hot. A friend of mine had one before and it howled. He upgraded to a 5870HD and his noise levels dissappeared, he thought something was wrong when the box was humming instead of screaming
The 68XX-series were noisy but those 69XX-series cards I've seen in friends' machines are not loud at all. Also there are many aftermarket coolers to buy or some brands offer even a better one like TwinFrzr etc.
I've used nVidia and AMD over the years and can not really say anything bad. Both offer good performance, AMD maybe more for the invested money as nV has always been the one with beefier price tag. But nevertheless I would recommend both brands, the rest is up to the buyer what he/she is looking for and the budget.