PSU & Case questions

1. Two Gigabyte G1 GTX 980 GPUs running on SLI: I've been told that my PSU (http://www.newegg.ca/Product/Product.aspx?Item=N82E16817182067) is somehow bad for my setup, that it hinders performance. True or not? If so, any recommendations?

Other hardware: ASUS Rampage IV Extreme Intel i7 4930 2x G.Skill 8GB DDR3

2. I want to replace my noisy and clumsy Rosewill Blackhawk with a Phanteks Enthoo, which apparently has already L337 (haven't written that in ages) cooling out of the box. Since towers have long lifespans, is the Primo (http://www.ncix.com/search/?categoryid=0&q=phanteks) overkill vs. the Pro version?
I'l probably also replace my current heatsink (http://www.newegg.ca/Product/Product.aspx?Item=N82E16835103099) with a NH-D15.

Rosewill Capstone series are their good ones. THe Xtreme are an older series and is serviceable.

As far as the fans, I wouldn't pay the premium for the pro's, but that is just me...

So the PSU is fine for my setup? Possibly it will bottleneck if I overclock in the future?

I've heard so many stories. One even claimed that a single GTX 980 required a 800-900W PSU for each card.

You need to stick with this site Rasko... people telling you a single 980 (or even two) requires a 900W PSU are flat out wrong.

PSU is fine as far as wattage and quality is OK. Not the best out there, but I wouldn't worry about it according to reviews I looked up (and was a link for your reference).