4 graphics card is not needed, and it will not last a very long time,i can predict they will last for 1year if ur gonna stress them out, only if u use multiple monitors, you will just waste your money on going 4-way sli on 1 monitor srsly
depends what games ur gonna play, bf3? i'd go with 670 its gives a little more fps and the 680 is 5% faster than the 670, and in some cases 670 will be faster, so i dont think that its worth buying the 680, and sry for multiple posts
quad cards for a SINGLE 24" monitor is ridiculous, if you had a six monitor setup, SURE go for it, but for 1 monitor stick with one card. Also the i7 is okerkill if your just going to be gaming not doing any office tasks, go with the i5 IB (i forgot the numbers lol).
OVERKILL usually means your flushing money down the toilet, and i work too hard for mine to do that.
+1 to motherferjones, just buy a i5 3570k if ur gonna oc, if not buy the non k version, its a little cheaper, and i would buy watercooling, h100, if you dont know how to install watercooling but if u do i would get a xspc rs360