I want to shoot myself for not upgrading from 660 to 660 Ti by only $30 more

Nah, don't worry. The price difference is equal to the performance difference between the two cards. You "might" get 10 FPS more out of the ti.

Keep that $50'ish and get an SSD or put it towards your next upgrade.
 


Don't worry that much. Winforce cooler is better. You are comparing best GTX 660 (OC, Better cooler) with Reference GTX 660Ti. That's why your price difference is less. If you compare with GTX 660 Ti MSI or Gigabyte Dual fan edition difference will be high.


So don't bother. For the money you paid GTX 660 Windfoce worth it