Shuttle SN45G replacement exhaust fan... what to get??

[Brassman]

Hey ya'll...

My SN45G is a big noisy and the fan sounds like it's dying... sooo.. that wouldn't be good if the latter happened. I've been looking to replace the fan, but I don't know what to get as I'm new to the SFF market.

Is there a "best" fan to get for this puppy...?

Thanks,

-Richard