I need your guys opinions and stuff (No giveaway inside)

No comparison, the 960 is the better card by a large margin.
More info if you'd like to check it out

The gtx960 and make sure its the 4 gig version
Almost every game I play at 1080p uses more than 2 gig easily
EDIT: I have a 960 SC at 1320 with 4 gig

I have a GTX 750 TI and it's alright, but if you can go for the 960. It's simply better.

960 wins DEFINITELY

Out of those two, the GTX 960 is a lot better than what the relatively low price difference would suggest.
But we need more details:

1. Exactly how much you're limited, space-wise? Specifically, number of slots, card length and width, PCI Express interface?
2. What's your budget? You might be able to find a bargain on something older (but still good).
3. Would you consider an AMD Radeon card? They usually have a better price/performance ratio, and they're not as bad as NVIDIA fanboys depicts them (although some NVIDIA-sponsored games run better on GeForce cards).

Now, a tech lesson for those interested:
NEVER get a low-quality PSU, as you would surely regret it, sooner or later!
When a good PSU eventually fails (and they usually last very long), nothing bad happens to the rest of the PC;
but when a cheap PSU dies (after a few months, days, or even hours), it'll kill some other PC components, or even catch fire!
Inform yourself before buying!

Before you order one do some research on a specific model. Sometimes a single letter or digit in the name can be the difference between a loud fan or a quiet one, 2GB or 4GB of RAM. Overclocked editions are rarely worth any markup as the performance increase is negligible, i.e 33fps instead of 31fps in certain situations.
And buy a decent 400-500W PSU. You don't need more power, what you do need is at least Gold efficiency status (better parts than in bronze/silver PSUs) and a good manufaturers warranty. If the manufacturer only gives 1 year then he doesn't expect his own product to last long. Minimum should be 3 years.
Edit: Just saw above comment. If a PSU dies anything can happen, i.e damage to PC components. Buying a good one reduces the risk.