Help Building Gaming PC?

So I was gonna build a PC and these are the parts I was going to use but I am having some doubts.

Intel Core i3-3220 (I may upgrade to i5)
Radeon HD 7850 Graphics Card (May upgrade to 7870)
Asus P8-H77-I Motherboard (Keep reading on for my problems with this)
8GB Samsung DDR3 1600MHz RAM
500GB Western Digital Caviar Blue Hard Drive
Bitfenix Prodigy Case
430W Corsair CX430 Power Supply
Molex Adapter

Okay, so I know you can't overclock the motherboard which is a real concern for me, however are there any other motherboards that can overclock or are better than this motherboard that can fit in the case?
Also, is there anything I should change? I would like it under ?400 but if it goes a little over that's fine.

Thanks in advance :)