I bought a blu, $29 kit from ??? (china), 30 kit from vaporsomething (510s), Ultimate shorty kit from Vapor4Life, Inferno kit from Volcano ($59), 3.7, 5, 6 v mods. I have 10 different brands of atomizers, megacatomizers, cartomizers, (best was the low res Bauway but even kept clean with alcohol prolly only get a month or 2 out of them, had the Volcano atomisers last 3+ months and still going... the cheapy 510 kits burntout in a few weeks or so to a month. The vapor4life are excellent, but draw, refilling, flavor, vapor can't out do the Inferno (ego 650ma with built in usb charger\passthrough manual) with standard 510 atty I use most and can't live without (basically and ego\riva) I prefer drip tip but its a bit more fussing with bottles but never a toungful of juice and easiest draw. What I've learned ... Carts right out of box auto or manual get a little tiring on the jaw and often extended use give me headahces PG or VG. Like WomenOfHeart said with a manual its a bit better for carts because you don't need a draw to prime it .. but (like dormouse said) still feels a bit like puffing on a cigar and tends to tire the jaw and takes away from feeling of naturally smoking. I still use the vapor4life manuals and carts.. prolly the easiest to walk and travel with .. but my staple and smoking replacement choice and highest recommendation for easy draw, longest battery (they last all day and even days when plugged in to usb (laptop car cig adapter and PC at home) IS the Inferno $59 with a few extra atomizers ($7) they have beat all others for 3 months and should easily last 6+ months. Never got a sore jaw or headache while using it. PG vs VG I've read and believe unless you're alergic to PG (sore throat should tell you this) its doubtfull its causing headaches. I'd worry more about OTHER ingredients.. like flavorings and additives... and nicotine level (see dormouse BTW)
PS you can also get a $3 adapter and like dormouse said again

try a LR atty or cart on an adapter or Inferno (ego battery) you need even less effort to draw and even less nicotine to achieve the volume and TH you may be spoiled with
