Nah, the CE4s are crap. I use CE5s and do great with them. I had one CE4 and if it's still around, it's shoved in a drawer or something. Get mine over here:
Vision Stardust 2.0 Rebuildable eGo Clearomizers. Don't ask me about the name. Nobody seems all that consistent. But "2.0 rebuildable" is a CE5. Unless it's a CE6. Or a version 3. Please, somebody, come up with some consistent names!
Either way, the ones that look like the ones at Value Vapor are good. I use them. From that vendor actually. Very happy (he also ships like lightning, I've found a few vendors out there that ship out so fast, you'd think they use a time machine or something

). But they're widely available. And not expensive.
I have a Vivi Nova Mini and it works great. I didn't end up using them regularly just from personal preference. The "barrel" shaped clearos just don't look all that hot on a battery in my opinion. It was just that. The quality is good.
And while I haven't personally tried one yet, the EVOD is recommended a lot around here. Kanger has a good rep on the forum. I may get an EVOD myself eventually, see what the hoopla is about.
(I'm playing around more with liquids lately and my Visions work fine so I haven't been buying hardware lately)