on the site for the cpu fan, it says its ok with 3.4ghz and up, but thats stock, a overclocked chip will run loads hotter. you should be safe going up to 3.4ghz, check ur temps, and overclock according to temps. 5 case fans is alot and might not do any good, unless they are all set right. So, oc about 100mhz at a time, and run for about 30min, and check temps, and repeat until you are satisfied(but stop before it fry's)
EDIT: if you want some great power for games, low price, runs cool, then fully upgrade to amd & biostar, or if u got the bucks, im not an intel guy, so this says alot, u might like the new conroes comin out.
EDIT: just readin it, and it sounds like you want to oc a full ghz! thats insane, u better get some mad cooling like liquid or some ****