My hard drive has failed on me, luckily I had backed up recently. I'm going to be ordering a 1-2 TB drive as a replacement. Since I'm doing this I figured it would be a good time to upgrade some other parts. I did this build a few years ago and it's showing age on newer games. I don't want to upgrade my motherboard. So I was just thinking of getting an additional 6GB of ram, and switching to a single GPU. I've never had any driver issues with SLI, I just don't like the additional noise, heat, and power consumption. What's a reasonable GPU to upgrade to? Would a 780 be overkill for the rest of my system?