Firstly, software temp sensors (and even BIOS) are not accurate, and may be as far as 10C off the actual temps. I'd go with the hotter reading just to be on the safe side.
I also use TAT, which seems to be a pretty good program for my motherboard. But realistically, any software sensor thats compatible should be good enough.
And the 9500? My Thermalright Ultra-120 Dwarfs it. Its so huge that I had to remove the side panel fan to fit (it comes right up next to a mid-tower ATX side panel). I'll have to post a pic one day.