I'm quite confident in my Rosewill, it replaced a PSU that was giving inconsistent 5v and causing issues, and I haven't had any problems since puting it in. It's also got the 24 pin ATX (with the extras snapping off for my 20pin) and a pair of 4pin +12v that combine to the newer 8pin +12v connector. It's rated for 550w and my system as it is runs (according to an online calc) at 284w. The new system would be about 330w, which is still way below the max total. Yes, I realize that doesn't take the individual rails into account but with only 1 hdd and one optical drive, 4 fans, and nothing else, I'm really not using much on the 12v rail normally, anyway.