Upgrade from GTX 480 liquid cooled.

What can I say. This card was my brothers. Came with liquid cooling I paid like 125$ for this thing..

Firstly is it still worth around this $$ amount.

If so, what would be my next card If I had 100$ to add making 225$ my budget?

I understand that's not a lot of moneys to work with, but I want to get a little closer to up to date.

Can play everything right now. With the help of a physx card though.....

Biting the knuckles right now looking at prices. A 780 would be great, but obviously way out of the price range.

Please help with my problem.

I currently game at 1080P. Clocks daily are 800/1900. Can bench at 940 or more depending on temps and ram speeds.

Can I beat this?

Arrg. GTX 660ti??

I go here for quick comparisons. Not sure if this information is totally accurate...
http://www.hwcompare.com/13164/geforce-gtx-480-vs-geforce-gtx-660-ti/

Would this even be an upgrade?

EDIT:

Ahh. after doing some research while waiting for replies.... I decided that a GTX-760 would be a good route and possibly run two or three of them in the future. Maybe like 6 months from now I can get that set up...

OK does this sound good? Looks good on paper to me lol.