Hi,
Thank you all for your inputs. A better disk setup is something I definitely need and I'm going to get one more seagate 2TB and RAID it with my existing drive (one I use for archiving) and use it as a work disk.
GTX 770 was always there on the back of my mind and now I get your approval.
On a side note, if I get another 650 Ti Boost and SLI it? Good, bad, ugly?