A few things...
First, what vieocard will you be cooling?
Second, while the general concensus is that the Swiftech Storm is the water block of choice, it's availability is scarce. It can be found in Canada but without the AM2 retention mechanism so that would have to be found seperate. However, an ample replacement can be found in the Swiftech Apogee. But, before I'd list any parts, I would need to find out about your videocard.