You seem to be set on the RN4081. I've had mine for about a month now, use it all day, every day, and love it. The RN4081 = Pee Wee = NJOY-NPRO, and a few others. If puresmoker is out of stock, and you don't want to wait, check NJOY. NJOY is also sold on costco.com, Pilot Truck Stops, TA Truck Stops, Petro, and a few others, but puresmoker has the best prices. I bought mine from NJOY because PS was out of stock at the time, and I paid about 30 bucks more.
I love my NPRO, but *do* check out others after you have your first one. You'll need a spare, in case you're first breaks down. Without a spare, you'll probably go back to tobacco during the wait for a replacement, and that *won't* be a good thing. 99% of the good people in this forum will steer you in the right direction.