Please evaluate my GPU selection

I currently have a GTX 260, which is a relatively out of date card compared to my i5-4670K. It's large, loud, and hot, but does 4xIR in LoZ: TP.

I am considering upgrading to a newer one for several reasons:

-OGL 4.4 support
-D3D11 hardware support
-Power efficiency
-Size
-TXAA/FXAA

I am very interested in the new Maxwell GPUs, but I want to make sure I'm not taking a step backward in Dolphin performance/capability. The GTX 260 has a memory bandwidth of 111.9 GB/sec vs 80 for the GTX 750.

Assuming that the GTX 750 will do 4xIR in most games (notably Zelda TP and SS), is there any advantage to obtaining a GTX 750 Ti from Dolphin's perspective? The Ti is relatively hard to find and expensive currently compared with the standard 750. The suspense is killing me.

Finally, I've read some recommendations to stick with the 760 or better because of upcoming changes to Dolphin. Would those changes preclude the Maxwell GPUs as well? In addition to being more expensive, the 760 is a giant card. Of course, the memory bandwidth is also higher than my GTX 260, so that may be the final criteria.

Specs:

http://www.geforce.com/hardware/desktop-...ifications
http://www.geforce.com/hardware/desktop-...ifications
http://www.geforce.com/hardware/desktop-...ifications
http://www.geforce.com/hardware/desktop-...ifications