i found a 670 for 340$ is it worth it from the 660ti?
Yes, that is a great deal. But for me, I think you should go for where you can save more money and then upgrade your cpu to i5 3570k (if youll oc)/3570(if not). But if you could go for that 670 and still upgrade your cpu then go ahead. I wish shou could also see cards like 7970/7950 at cheaper price range because they would be a better deal if they will be cheaper.
meh ill probaby stay nvidia, had bad experiences with amd/radeon
okay then just go which your heart want's you to go. It all merely goes down to personal preference, ther are those who had bad exp with amd so the stayed away from them and same thing goes with nvidia. So just go which ever you want.