I'm using a 510 all stock with manual batteries and a PCC. Looking at the eGo. I need a rather high mg, around 36, to keep the headaches at bay, but I can live with 18. I'm still trying to find a PG and VG mix I like. I want a lot of smoke and throat hit A usb passthrough is also on my list. None of the flavors I try really captivate me except for that Wild Strawberry you sent me [I usually hate the artificial strawberry flavor] and the Cola flavor I got from FreedomSmokeUSA yesterday. I think I may need to go to an eGo for the longer batteries, hotter atty and higher juice capacity...