I'm using Macbook Pro 15" running Windows via Bootcamp (The hardware in the Macs is quite good). I have 2. When I purchased the hardware wasn't sure I wasn't going to use wirecast or Vmix, but after a no time flat decided to go Vmix. I couldn't find a PC with twin thunderbolt ports back then. Still hard. I use Magewell USB 3 capture devices (Primarily on my laptop), Black Magic Mini Recorders and most recently added one of these to get more ports: http://www.belkin.com/au/p/P-F4U085/ so I can have more full speed usb 3 ports than the macbook pro provides.

If I had a chance to start over and buy again I'd give this some serious thought (HAVE NOT TRIED IT, but I want to, already spent my money):

http://www.dell.com/au/b...ion-m3800-workstation/pd

Plus a thunderbolt PCIe Enclosure. Which is what it looks like you are interested in.

For all the Mac haters, they run Windows quite well via Bootcamp :) For quite a while it has been very hard to get a native Windows Laptop with the nice hardware of a Macbook Pro. That's changed recently.