Good thing you posted before buying.
9/10 people buy a 3200+ then skimp on other components.
Get a 2500+, it's 3 or 4 times cheaper, and it overclocks similar.
Get OEM, then spend the money you save on cooling (Thermalright heatsink), most importnatly name brand Power Supply:
Many PSU manufacturers list specs that do not reflect true capabilities of their products so all info on the PSU label doesn't mean much except for the brand, just look for the brand: All Antecs (Channel Well) are good (Antec True Power is better), Fortron (Sparkle), Sirtec (Enlight, Vantec, Thermaltake), or more expensive Herolchi (Heroichi), PC Power and Cooling, or not as good but not dangerous HEC, TTGI, Zalman (Aopen).
Quality RAM.
You will overclok the 2500+ with these components further than you would 3200+.
It's the other components that count for overclocking. 2500+ and 3200+ are similar chips unless you have extreme cooling already.
Make sure you get an nForce2 board. (Abit is the best overclocker).