I have a PS3 40GB fat I got years ago and I just started downloading PSN games and I am out of memory. I was thinking of buying the New Super Slim model that comes with 1 year of PS Plus.
Should I buy the PS3 Super Slim Bundle (300$)
Buy a 500GB PS3 Harddrive and a year of PS Plus but keep my old PS3(100$)
If the system still runs well, I'd save the money and buy a bigger HDD (you can get 1TB HDDs for around $100).
Or you could get your 500GB HDD, and year of PS+, then start saving up for the next gen Playstation, which should be out within another two years or so...