I also have to say don't remove the fan. A general rule of thumb, if it came with it, use it. Or, you will have stability problems...if it even boots up at all. Even systems that don't have a fan mounted directly on the mobo still have some type of cooling air flowing across that heatsink. A lot of HP Pavilions have a fan drawing air in through the front panel and blowing directly across the CPU heatsink.

I think you just need a good quality cooling fan that doesn't make a ton of noise.

You might try performing a Google Search for 60mm cooling fans...lots of items come up. Good Luck!