as i said, STICK with the stock HSF unit... the stock HSF is good enough for some testing and tweaking... once you got the hang of it, you can get a HSF that suits your needs...
i wouldnt recommend the zalman, unless youve got plenty of experience with replacing parts inside the case...
the SP-94 HS from thermalright has great cooling capabilities, but it would need a good CFM fan (thus often DB) to dissipate the heat from it...
stick with stock.. thats my advice, youll see/learn what you want soon enough when the entire PC is running..
Zalman cools decently up to 3.4ghz i believe, so its up to you if you want to buy it.. im not going to, im working on insides of PC's for 2 years now (im 17) and i dont feel confident enough to place 700+grams on my CPU..