PS if you're a texture guy and use mari then you'll see a bigger benefit out of your gpu then you probably will in Maya again depending on if you're an animator or not.

I'll throw this in run Maya of an SSD going back to loading maya of a hd drives me nuts lol with the money you're spending i take it you have this covered

That said I used 8 x 4k textures in patches in mari last week so 32k texture on one model and had no problem with a gtx 660 so...