I'm thinking about getting a Zalman CNPS9500 HSF for OCing purposes but I'm not sure if I want to get it right away. Can I remove the stock hsf later and replace it with the Zalman if I want? The stock hsf will have thermal grease on it but can that be removed?
You can remove the stock hsf and replace it anytime you want. Thermal compounds can always be removed, just use like 90%+ alcohol and a coffee filter. Although there is still grease I think in the micro canyons of the chip that will still be there, but artic silver has a cleaner product to take care of that. It would be easier to get the zalman first, but its not gonna be hard at all to get it later so if you want to wait and put off getting a better hsf then by all means put it off until you want to OC it.