Another vote from me for Reaper. I have only been using it for a short while, coming from Adobe 3.0, and after evaluating a few different DAWs I settled on Reaper. I am running the 64 bit version on Windows 10.

I am not as far along in my learning curve as Noel is however! I have got as far as adding volume envelopes but haven't experimented with envelopes for controlling VSTs yet. Very cool indeed, Noel!