I run VMs and that takes RAM, processor, and lots of HDD space. My MBP has a 512gb drive and is about 75% full despite the fact I've deleted all of my music and most of the videos.Ok, I have to ask, why 16G ram minimum and a plan to upgrade to 32G in a year? Are you doing some intense huge photo manipulations, or rendering complex 3D movies or running virtual machines? Why 750G minimum HD? Unless you are keeping your entire DVD/Bluray movie collection on your laptop or have a ginormous pr0n collection I don't see how you could use more than a couple hundred G of disk space.
I'm running 4G ram and 500G HD on my desktop, I never run out of RAM and my HD is under 30% full.