OC MY NEW SPEC.

I would get a better name brand psu.

hi op
yes if you want to oc i would suggest picking up aftermarket heatsink as ocing increases your temperatues
yea the case is fine...it will fit atx or mini atx mobos
and as christop said above get a psu from Antec, Asus, Corsair....not cooler master

Get a better PSU: Antec, Cooler Master and Corsair are the only one i used and i never had one failed on me... (had a Antec NeoHE 500w for 7 years now powering his second rig, a Core 2 Quad @ 4.05ghz and dual 560-ti... I also have a Cooler Master Silent Pro Gold 1000w for 2 years now 24/7 usage for my new setup (it was in my old rig then i swap it as it's newer and better (currently on a 3770k 4.87ghz and a 680, i plan on a second one soon) Corsair works well but the
fan is a little more louder than what i wanted so i return it to change for the Cooler Master (it was an AX750) and i don't regret it  

you should grab a good cooler for your CPU if you want to overclock (i can suggest the HYPER 212 from cooler Master that sells for about 30$ and sometime 15-20 in rebate)