I have Sims 3 + all expansions. I only have one stuff pack though. It pretty much takes up my entire computer harddrive.
It's a fun game, and I'm addicted to it, but mine crashes quite a bit. My computer is good for gaming, but Sims 3 seems to crash still. Sims 2 never crashed for me back when I played it.
Excited for Sims 4. Hopefully some of Sims 3 weak points (crashing/lag issues, slight bugs - like the fact that my doctor sim went to work and just stood outside the hospital for 6 hours) will be fixed.