I ordered the Sapphire x1950PRO the day it came out. Ever since I built on Dec. 25th, I've been great. I used to crash, but it's because I had bad drivers. I used Windows to delete everything ATI related including drivers, and started all over again and downloaded everything from sapphiretech.
Concerned about heat? I run rivatuner to crank my gpu fan speed to 100% when I game. But in my opinion, that should be done no matter what card you have. My card is just chillin' right now at 43C.
Stacker 830 - e6600 @ 3.6ghz - Eva 9800GTX+
X-Fi Xtrememusic - 4GB OCZ SLI 1066
Sceptre 20.1" - Logitech Z5500 - Gigabyte DS3 965p