Fight two between my favourite PVs...
RSM Cruiser 2 V ProVari
The ProVari is a great
device, highly functional and dependable but compared to the Cruiser it is ugly and heavy. I only ever need the Cruiser to work with a 1.5 ohm 306 so it doesn't need vv and it holds 6ml of liquid.
So I'm down to the RSM Cruiser II v Touchwood mini.
No contest, no point kidding on, the Touchwood mini is beautiful but loses out on every other aspect. Pity, I love the brass and seasoned wood look.
So my one PV would be my Red Sky
mods Cruiser II.