What screen res are you playing at? i dont think youre going to bottleneck unless youre playing at maybe 1080p and playing skyrim or something like that, i could be wrong tho. thoughts?
also the 650 TI is nice but its also like $150 in USD (no clue for you)
also SSD are good but also cost aton and you get less room on them, they are faster and better but with a 500 budget i would ship the SSD and worry about something else for the time.