That's exactly what I use, and I'm pleased with it. The eGo tanks take a little maintenance to keep running properly, but it sounds like you've already got that down. Once a week I strip, clean, and adjust the two I keep in rotation, and I'm good to go for the week.
I also still use my ego batteries some. I want to keep them around for backups, so I typically use one of them till it dies, recharge it, and go back to the provari about once a week. A battery that lies around and doesn't get used is a battery that won't work when you need it...