"HV Attys" have extra resistance so that 6v or 7.4V will "feel" more like 5V. Using one with a PT is only going to further reduce the voltage, so you are better off with the standard atomizers in this case. What you might enjoy is actually a
low resistance atomizer like the Magnum (1.5 ohm) or Fibonacci (1.618 ohm) atomizers.
As far as the power goes, as Quitter mentioned, if you're going to use a "straight through" like the PureSmoker PT or one from Madvapes, you really want to use a plug-in USB adapter or a portable power pack that is capable of putting out the power you're looking for. You
can use the PT with your laptop or Xbox, but it'll be more like vaping at 3V.
Unless you have a good plan for the power supply like quitter suggested, you might be better off to consider a mod. If you like the PureSmoker design and are willing to pay a little extra, you might consider bumping up to a mod that does double-duty as a pass-through or simply using one with an in-line battery. You will be "limited" to voltage of the 3.7V battery, but those usually run around 4.2V so it really is a noticeable step up from a stock 510 battery.
That said, the
MadVapes 5V 510 Manual USB Passthrough is only $15. I have one and I just tried using it on my Xbox 360--it works well, actually, but its closer to 4 volts than 5. In fact, I just switched the same atomizer from my Xhaler at 5V (also tried at 6V) and the PT was indistinguishable from using my DSE 905 Nomad at 3.7V--still a nice upgrade from stock batteries, but not quite "high voltage"