Ok I am going to really out do myself on this one.
If I change my motherboard I am getting a Z68 chipset. Can anyone make recommendations?
Second is, If I add another Zotac 460 1gb which is really my only option because I am not laying down 300 on a new card. Question is, will my power supply be able to power it all? I am sure it will but just making sure.
Z68 is kinda worthless unless you're gonna use QuickSync. There's really no point in IRST unless you're on a very small laptop. That, and the extra video outputs on Z68 motherboards will limit your I/O options. I'd recommend staying with P67 for the best bang-for-buck. If you want to get a high-end motherboard for a low price I'd recommend you get the AsRock P67 EXTREME4.
As for the GTX 460 in SLI, your current setup with two OCed GTX 460s and an OCed i5 2500K (1.35V) will only consume around 550W max at the wall (350W for OCed GTX 460s, 150W for OCed i5 2500K, 50W for peripherals/IO), so it'll be just fine and with some headroom to spare. Taking into account 82% efficiency, the PSU will only have to produce around 450W. Don't trust what PSU calculators tell you.