But what will you do in the summer when the big guns come out? ;-) amd are planning heavy miner gpus. What do you think nvidia is going for with such low power overheads for such a low price :-)
Likely spending the rest of my mini-MAX coin "fortune" lol. Already building 2 6*7950 rigs and just researching what I'd like to do with an Nvidia rig. The new Maxwells are tempting with a ~90 break even and low initial cost.
Also, I doubt AMD has something lined up unless it is very specific to the mining market separate from their GPUs. The R9 290X is already based on their new architecture Hawaii and is very power hungry and hot, so they'll need another approach before they release more, lol.
AMD has of course a card lined up against the 750Ti, the R7-265. How effective it will be, remains to be seen.