Sure jlmanno ...
The type of mod really depends on what your preferences are ... Judging from your join date, I would assume, you currently have a PV or several

With that said, the Protege is much like a standard ecig battery, except, it holds its peak performance longer. You know that feeling when you put a fresh ecig batter on the atomizer, and the first 10 hits are great? Well, multiply that and you get great hits for several hours before performance really starts to dwindle. Now, if you prefer something MORE than what your ecig batteries can do, then your next options would be a 5v PT, 5V mod Device, or 6v device. The bigger voltage mods tend to give better throat hit, and produce a bit more vapor than your standard 3.7v ecig/mods.
A 5v PT (your high end type PT's) aren't truly 5v ... They are more around the 4.2 - 4.3v area. They provide roughly .2 - .4v more consistently than your standard 3.7v ecig battery. The beauty of PT's is that there are VERY consistent. As long as you feed them the power (a USB source) they will stay at the same voltage.
The beauty of the Protege is, you can run it as a 3.7v mod when you are away from the computer, but if you are by your computer, you can put the USB Extension in, and vape at 4.3v consistently, until you need to get up and go somewhere
Hope that helps a bit. Let us know if you have any further questions jlmanno!