Now according to the Nvidia website, the difference between these two are rather minimal. Even though I find a 660ti to be around £250 whereas a 660 I've found for only £138! (When I find the link I will post it just a bit fishy to me as other places list it for around £180 or higher. Thought it has the same specs.)
So which is worth it? Go with a 660 or spend a few more quid for a 660ti which may last a little longer?