Is your 2400 multiplier locked? If it is, you can still get it up to around 150 fsb with a good heatsink... that would be 2250... 2150 might be fine with the stock heatsink... but 148x15=2220 might be a good setting...
If your 2400 is not multiplier locked, you could get 13x167=2171... either way... your computer is very fast... If both are locked, keep the 2400... unless you have a good heatsink and overclockable ram... if either are unlocked, get it and use it!
<font color=red><b>The mind is in its own place, and in itself
Can make a Heav'n of Hell, a Hell of Heav'n.</b></font color=red>
John Milton, <i>Paradise Lost</i>, Book II