An SSD isnt the be all end all upgrade and does absolutely nothing for gaming except change loading screen times. What I would do is a cpu,mobo, upgrade first and reuse what you have, possibly a ram upgrade to or new psu although the PSU is 480 watts and would power everything fine but dont expect it to be some highend Season.. You can reuse your case, HDD, Optical, and the 6770. If I had to upgrade the few pieces I would do 1. CPU+motherboard 2. addition of 8Gb 1600mhz ram or better PSU, 3.SSD 4. Keep the 6770 and save for a mid to high end card for next years 8xxx and 7xx releases. On that note how much are you willing to spend?