I'm looking to replace my 17" MBP in my signature and the 13" MBP did draw my attention. Ever since I built a PC last month for gaming, I no longer have a need for insane specs, so I'm wondering how well the Iris graphics on the 13" runs the Thunderbolt Display. I know I will also be going from quad core back to dual core and would like to know how much of a performance hit I'd be taking. I use Handbrake (though I will likely offload that to my PC), iMovie occasionally, iTunes, iPhoto, Safari, MatLab, R, and I virtualize windows 7 via VMware fusion.