I have 2 8800GTS' in SLi mode (SLi just means minimal performance gain with a stupid amount of heat ...)
My cards idle around 55C & reach about 60C playing LFS.
Have had temps up to 75-80C when playing Crysis...
If you're just playing LFS then yes, thats a little high. If it only reaches that when playing demanding games, then you're fine
Sarge.