If you've been using the CE4 you're using a disposable (cost at Easy Vapors: $2.15). The CE4+ (or CE4 Plus) has replacement coils that I've seen at Easy Vapors selling 5-for-$6.49, so they're hardly expensive. And you can buy the nondisposable "tank" with a coil in it for $3.12 at the same place. I'm not pushing Easy Vapors but that's just an example.
Glass tanks are pricier and will inevitably require replacement coils because no one would pay the higher ($5 to $10) price for a disposable. I got an Aspire ET-S BVC Clearomizer (glass tank) at Mt Baker for $6.89, and they also sell the coils (5-for-$8.49). Again, I'm not pushing any supplier.
I mention these two because (1) they're in your comfort zone, (2) they'll work with your battery, (3) they are well known and so you can easily Google them to find suppliers and compare prices & shipping costs. The tank-cracking flavors are well known so use the glass tanks for them. The cheaper tanks are fine otherwise.
I don't much like the CE4+ clearos so I use the EV-H2, which is similar but has a bottom coil. Filling the clearo is less convenient but you quickly get the swing of it and the clearo holds more fluid than the CE4+. The EV-H2s don't have that that removeable tip, which gets gross after a while. I just ordered a mixed-colors ten-pack, coils included, from Derall for $16 (free shipping)! The coils are not as easy to find but range in price from $1 to $1.50. Derall is out of the 2.4 ohm coils at the moment but will probably restock them. Easy Vapors always has them in stock, 5-for-$7.10. {Note: Easy Vapor has FedEx shipping only (new policy) so you'll pay at least $6 for that.} My thought is: Why would I buy 5 coils from Easy Vapors for $7.10 + $6 shipping ($13.10) when I can buy 10 clearos-with-coils for $16, no shipping?
I wouldn't jump too quickly into the more sophisticated gear. As Friar Laurence said, "Wisely and slow. They stumble that run fast" (Romeo and Juliet). His advice was ignored, and the consequence wasn't pretty.