Psu choice for a lanbox

Hi there

Here's my issue , im building this gaming lanbox from a radio here's the link to it:http://in.rsdelivers.com/product/bosch/power-box-230v/b...

so im limited on space, the interior will have basically to stories, 1 floor---psu and hdd then second floor mobo and all the other components. I kinda figured out my stuff, but i really would need some help on a good psu but in a small form...i mean all the expansive things come in small package (diamonds) ...
so for me to fit the psu than a 1 tb hdd and a 64g ssd...on 1 floor i need a small psu but good enough to run this things.

MOBO--H61M-D2p-B3....gigabyte
ram ---2x4 g gskill x
cpu ----i5 2500k
hdd-ssd----1tb +64g
Cooler---http://www.frozencpu.com/products/12494/cpu-noc-19/Noct...
GPU -probably a gtx 560
wireless internet card


looking to oc the cpu.

so what psu should i use? ...remember space its limited....i can come up with the 3.4 Inch high but i need width and depth small......