I have both Kanger Subtank Mini and Innokin iSub G, I prefer iSub G for flavor. If you want to eventually want to get into rebuilding, then I would get Subtank since it comes with rebuildable deck. Also, iSub G goes through juice like no tomorrow.
I use a IPV mini v2 but there are tons of reliable hvariable high wattage devices that good for the budget these days.