Re: Opinions on Approx. $1000 Gaming Rig
To answer your first question... That isn't a terribly large jump, but a notable one.
Intel Core i5-4670K @ 3.40GHz Passmark - 7746
Intel Core i5-3570K @ 3.40GHz Passmark - 7119
Secondly, looks like June 25th for a release date.
NVIDIA GeForce GTX 760 Set for June 25, 2013 Release
ABSOLUTELY! Get an SSD. I'd recommend a 128 or something along those lines to run your OS and main games off of, keep that 2TB for extra storage.
Additionally in the requirements for the GTX 660; it requires at minimum a 600 watt PSU. So you'll need to up that especially for this higher end system. I'd go 700 just to be safe in case you upgrade GPU's down the road.
-Desktop- Dual Monitor, Q8200 2.34Ghz, 8GB, 1TB, XFX 6850, 7 Ultimate
-ASUS UL50- SU7300, 4GB, 500GB, G210M, 7 Home Premium 64, XP Pro
-HP NC6400- Core Duo 1.86Ghz, 2.5GB, 64GB SSD, x1300, XP Pro