I've been waiting for the refreshed iMacs but it appears that may never happen, so I'm about two weeks away from ordering a rMBP. The build I'm considering is the 2.6GHz, 16GB RAM, and 512GB SSD or maybe even the 768GB SSD. The thing is, I wanna game, and will create a bootcamp partition for Steam games. Should I just get the 768GB HD because of this? I do have an external TB drive, but I don't want to install and load my games off the external because that will 1) take up space on the external which I use for backups and 2) wouldn't it be too taxing on the drive and increase the risk of HD failure? But then again, it is thunderbolt so it may possible handle the load times and data transfer. I'm looking to allocate about 400GB to bootcamp?