have you ran a video card test at all?
what brand of power supply did you pick up? im of course assuming you did this yourself since it sounds like you have a fair understanding of computers and built this one yourself.
i dont know with any certainty if it is your power supply still but judging purely based off of how much you paid for the new one im going to say it just might still be that. cheaper power supplies skimp on really important parts on the guts of the setup, this often results in only one of the voltage lines (6?) getting the rated wattage while the other gets less and often unstable wattage. its a cheap marketing trick, often it kills your hardware as well. #1 reason why i will never buy pre built...
if i were in your shoes this is what i would do, upgrade to 1.4 and try it out again, if it still lags go get a video card testing program and see what it spits out. compare that to results posted online using the same program. also upgrade ALL yourhardware drivers to get them up to date. if its still not fixed my guess is one of two things has happened. either you still arent getting adequate power OR the previous power supply has fritzed out your video card (im leaning towards power supply) if you do go get another power supply dont cheap out on it. the difference between a good power supply and a crap flimsy garbage box is the lifetime of your hardware connected to it.
pretty much just rule out every option you can. hope this helps you
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