750Ti still seem like a really good choice imo.
I guess the prices will go down a bit also now when new cards show up ?
Me myself are buying used 750Ti:s for like 80 bucks.
All my 750Ti:s produce around 7.1-7.3Mhs @Quark superstable.
I've spent the last week trying to get more out of my 6 x 750ti & all I can get is 6200 each and then its not 100% stable

Can I ask how are you getting 7000 out of yours?
You need to use the release 65. The asus strix 750ti does 6,25MHASH on standard clocks. x86 windows. (the remaining 12% should be possible with overclocking)
You can also use the new option -C to let the cpu aid the gpu as well (but it will draw more power)
I've got 6 x GTX 750 Ti StormX Dual that are clocked at 1202MHz & are using r65 ?