Good idea to move up to 5 volt vaping with a pass-through. However, you don't want to be plugging it into your PC's USB port. First, you won't be getting true 5 volts from your computer and second, it can damage your computer. You need to get a 5 volt/2 amp USB to AC wall adapter that you plug right into a wall electrical outlet. And I assume you are using manual batteries and not autos.
If you like the much better throat hit and consistency of 5 volt vaping and decide to upgrade, I would suggest you look at the 5 volt GLV2 from Great Lakes Vapor or for less money, one of Ken's 5 volt box mods. An even better option would be a good variable volt PV such as the Darwin from nhaler.com or a ProVari or Infinity.