Help with a micro PSU

[fruity_south]

Evening all. Its been a while since iv been on here now the evenings have got colder but i need some advice and i always seem to get the right sort of answer on hear.

 

iv been given a computer which i want to shrink down to a smaller box. basicly making my own box like i did when i was a kid. but with technology moving on so much i was wondering if i could make it smaller by using something like this as a psu. the computer would only be used to watch the odd film and will include two hard drives and no cd rom. heres a link to the psu, even if its not the right one if someone could point me in the right direction would be good.

 

http://www.ebay.co.uk/itm/Mini-ITX-Car-PC-Power-Supply-PSU-Board-DC-DC-12V-120W-/300561293594?pt=LH_DefaultDomain_3&hash=item45fad9611a

 

the motherboard is this one:

http://www.computerparts-hardware.com/china-desktop_motherboard_use_for_hp_dc7200_dx7208_dc7600_mt_945g_375376_001_395430_001-112402.html