GameInformer

600w should be plenty for a 6950. I have to ask though, why don't you check out the 7000 series? It's a lot better than the 6000 series, unless you're going for them because of the price drop due to the a new series, but in that case I'd just recommend Nvidia's 500 series, since it destroys the 6000 series, despite not being as good as the 7000.

I'm not paying 500+ for a 7000 series GPU. Also the best NVIDIA card I can reasonably afford is a 560ti and I'm not sure if it's actually all that better than the 6950 in performance or power consumption.

Take a look here for some quick comparisons on card performance.

www.tomshardware.com/.../3DMark11-Gamer,2659.html

Dont get confused by the chart the top 10 or so cards are crossfire and SLI.  The 6950 is comparable to the 560ti.  The difference between a 6950 and a 560 will probably only be like 5-10 fps.  If you got the cash I would recommend a 570.  Ive been running mine for almost 2 years and I love it.  It tears through almost anything I can throw at it like a joke.  They are about $80 more than a 560 or a 6950 however.  

As for a 6950 on a 600w power supply you should be fine.  From what I can see all 6950s take 500W so there should be no issue.  Unfortunately with PCgaming there are no guarantees sometimes odd things happen.  

I don't know about getting a 570. I would have to buy a new PSU and for the money I would have to spend I might as well just go ahead and get a 7950 which uses less power than any of these cards... and it's 3x more powerful. Only problem is that it's $450. I just don't know if I can bring myself to spend that much money on a GPU... I want to... but that's a fn' lot of cash for video card. I really just need something affordable that can handle high/ultra settings at 1920x1080 and i'll be a happy camper.

I only recommended a 570 because I have personal experience with it and have been extremely happy.  1 will run on a 600w psu and come in about $100 cheaper than a 7950.  I also tend to stay away from brand new series cards for 6 months or a year.  It takes some time for manufacturers to work out all the kinks with the new technology, the prices also tend to be somewhat inflated do to demand.

I will give credit to AMD the new 7k series so far looks nice.

Thanks again for the advice. Went ahead and bought the 560 ti after doing a little more research. Just installed it actually... works great.