After having replaced my screen on my z71v I think I much prefer it over the z70. I like Sata, and it does make a performance difference. The laptop is deathly quiet ( though i don't care about the sound really) the laptop stays super cool, I can use it in my lap perfectly. The video card is replaceable, and since I overclock my card that's useful even if an upgrade never comes out. I never use bluetooth so that option is useless. The design of the case means little to me, and I think the z71v is an awesome design anyway, I always get compliments every time I pull it out. It doesn't look like the typical standard black laptop like the z70 does. The chip was easily overclockable so I got a 2.1 out of a 1.6. I would say cheaper but with the price of the new screen it's same cost. Besides the screen I think personally the z71 is the superior laptop. The graphics card seems to hold much more overclocking potential from what has been attempted so far on the forums, and 3d performance is my number one concern being a video game artist by trade. There was also the time sensitive fact that I had to buy my laptop before the z70va was even available, but that's not relevant anymore to someone buying now.
I'm not saying the z71 is superior for everyone, but in my case even if offered an equivelent z70va right now at no cost for trade of my z71v, I woudl decline. I feel teh z71 is superior for my needs.