So now we have different opinions on this... BTW eVGA website says min. PSU recommended is 450W, the issue is whether 12v, 18A is sufficient or I have to upgrade to 12v, 35A PSU (like the one I mentioned in 1st post.)
From experience I've had times where my system would take 7-10 mins to just boot into windows, and when it did. The mouse would move at an inch every 5-10 seconds. After research I found out that even the graphics card I had need a minimum off 300, and I had a 350w, it still needed more power. Nothing bad would happen to your system other then it going slow like mine did, or some graphical issues due to the card not receiving the necessary power. A lot of people would recommed to have a certified 80+ psu that delievers sufficient power all the time. A budged of 50-60 on a good PSU would be tough. Your best bet is to look at some on the upcoming black friday deals. As for actually running it on the PSU you have now is pretty close. As the minimum requirement nvidia has posted is 450w. I'll show you some good 500w PSU's for about 60-80 bucks. A 500w in your case would be fine.