I recommnd rivatuner v2.06 as it will give you your temps and you will be able to speed up the fan on your VC if neccessary. I know you can do this with speedfan, but rivatuner is a little easier to work with IMHO. Not to mention you will be able to overclock if and when you decide to with rivatuner.
If you know the safe zone to oc your video card nibitor is the way to go I posted the difference in benchmarks with a driver oc compaired to a hardware oc and the difference is over 200 points better with the hardware oc.
Rivatuner v2.06 works in both vista 64 and 32 bit now. The only issue I have had thus far with v2.06 is it not liking some drivers, but it still works. You get a pop-up that says rivatuner does not like the current video driver or something like that and you click ok and it lets you do what you need to do. v2.05 did it the whole 3-4 months I used it too.