VA Represent!

I think you're going to like the 510 on the Protege, most people seem to really love the 510 at 3.7v.
I've always liked the 901 at 3.7v for flavor, but until I got my V2, I never realized just how much throat hit I was missing at 3.7v with the 901 and to me throat hit is crucial to feeling like I actually got a hit. The 510 at 3.7v to me is the way to go and like DICKW said, you can get another adapter later on if you want to experiment. If you do, I totally recommend the 901/KR808, I can't imagine vaping and driving without a cartomizer.