I am currently in the process of doning my first computer case mod I witch I am installing a Gaming system into a old Coretech mATX workstation chasis witch a SFX power supply is the old PSU that will fit... anyway i have found a PSU and 450W Silverstone... But know I can find a GPU that will fit in my case... most new Graphics card have the 6 pin power coming out one side or out the top in my situation... and i have not got enough space to plug in a graphics card. So I need a Graphics (either nVidia or AMD) that the power comes out the back of the Graphics (E.G) the EVGA GTS 450/450 Ti, but something with more grunt. Please also note that I Dont have any room to have tall cards or Cards like the ASUS DirectCU II cards that have heat pipes that extend above the graphics cards.
Im pretty sure Asus makes a GTX 670 mini, or if the cables are a little to tight just get an individually sleeved cable extension which wont take up as much space depending on how you route it.
if you could try to find a gpu that has the 6 pin connectors towards the direction of your radiator it would fit nicely, or even a card with recessed connectors like the evga 670