X800Pro cooler

The fan on my graphics card is intermittently sounding a little ruff almost like some bearings have gone or something. The fan is clean and appears to be fine so I assume it's something I can't fix without arsing around with it? I thought due to the low cost of fitting another cooler in place of the reference one, I'd do just that. Could you nice people enlighten me to an easy to fit and effective cooler for my X800pro? And yes part of me did say "why not just buy a shiny new 7800 sir" but this kind of behaviour is pure madness....isnt it? :crazy: (I'm joking)