I have just started using the
CE3 XL Clearomizers from VaporAlley.com and they are awesome. GotVapes will sell something that looks identical to them and will be calling them Phoenix Bottom Coils. I can't recommend these enough. If you fill these properly they work awesome and do not leak at all. Steeljan just put up a great review of the Phoenix bottom coils as well.
Those CE3's are the same as the CE3 "Smokymizers" from MIG. Royal Smoking, the manufacturer, has discontinued them and you'll find them mostly on clearance sales. PBursardo slammed them, as did most other people who wrote reviews. The ones on that site look like one of the knock-offs, or else an older version. The genuine ones come in a green and black box with a MIG hologram. OR, the ones at vaporalley might be the first version that had a harder plastic tube and was known to crack. The newer ones had a softer kind of plastic that didn't crack and was translucent rather than clear. They also came in colors. Anyway, because of all the .....in and moanin', they're getting hard to find so stock up if you like them. MyFreedomsmokes had them for $7.99 a box when I last bought some. I'm using them right now.
I love them. I've been using them for months. The biggest gripe everyone had was that they leaked as soon as you filled them. That's becuase nobody realized you had to put a condom (included in the box) on the battery end until you replace the filler plug in the filler hole. People also complained about having to use that tiny plug. The tweezers they include in the box are worthless, so if you use decent tweezers, it's no big deal. I've cleaned and reused them 3 to 5 times before they burn out. They're not something you want to refill when you're out on the town but, then again, no cartomizer is.
I'm using the 2.7ohm version on my lavatube. Other than that, Boge 3ohms are the way to go, although I've started using a Vision Stone 3 tank as well for lower voltages.