If you buy an OEM processor (i.e. NOT a retail one), then you'll also need to buy a CPU cooler.
The Best bet is to give us your budget, and we could make some suggestions. plus tell us if you have any parts which you plan to use, i.e. Monitors, Keyboards, mice, etc. as that would help.
<font color=red>The preceding text is assembled from information stored in an unreliable organic storage medium. As such it may be innacurate, incomplete, or completely wrong</font color=red> :wink: