I'll give my opinions on everything Rosa listed just for reference.
Ego tank: Absolute fail, horrible drop in taste, great vapor production. Even though mine is 2.8 ohm, it does not like being cranked over 4.5 volts before it starts to wick bad and burn fluid. You can taste the burn flavor real well, but the actual flavor in your juice is horribly diminished.
Fluxomizers: Re-branded Ce2R4s from Microcig. I order some clears when they first released their website. All broke in a few days. Ordered some metal cased ones and they lasted quite well. They have the best flavor and TH of anything I have tried apart from dripping on 306s ---- WHEN THEY WORK RIGHT--- The only ones I buy now are replacements for my MAP tank, and they work well there to give me 5ml capacity tank.
Smart carts I have coming from Clouds of Vapor. I'll post back when they get here.
Vapemate I bought because Rosa told me to buy it. I have sucked more juice into my mouth in the 4 days it has been here then I have over my entire vaping career. Dave is sending me some tubes for the bottles that I hope will make it better. It is Fantastic when you get the squeeze just right but the most misserable experience I have ever had when you suck in over a mil of just straight into your mouth through a drip tip. I'm practicing this weekend with it more, as I paid over 60 bucks for it and I don't want to give up.
In the end, I would say if your looking for capacity: Get either a MAP tank or a Mini MAP tank or a Stormy tank. Also use the condom method or a syringe for filling your cartos as they hold way more that way then trying to drip fill them. The syringe is a little more troublesome, but you can fill a cart from the bottom of the polyfill.
I feel your pain when it comes to capacity. I vape over 6ml a day, and really don't have time to stop all the time and refill. It's why I keep trying all this new stuff.