I've never tried the nautilus (probably should though, given the comments here!).
I have never been fond of the TCC clearos, and the IClear30 is probably my least favorite of those I've tried. It just doesn't wick well IMHO.
I started out with the EVOD heads; my wife+daughter still prefer these.
I have found some BCC clearos I really like, here's some FT links (NOTE: I tend to change flavors often, so I like smaller tanks):
Also, I have found that I prefer all-plastic designs to some of the metal ones. I wasn't crazy about the mini-protanks, because it seemed to me that the metal up-tube and tip just cooled down the vapor too much, but many people really like them. The plastic-uptube heads seem to provide a much warmer vape, which makes it more flavorful and pleasant to me. (Also, metal drip-tips feel "slimy" to me, and kind of unpleasant)
https://www.fasttech.com/p/1369401
The classic EVOD's. Good, simple, but I like the ones below better.
https://www.fasttech.com/p/1594202
I really like these H2's. Clean taste, very inexpensive!
https://www.fasttech.com/p/1640900
https://www.fasttech.com/p/1609800
Another couple of tanks that work well for me.
https://www.fasttech.com/p/1754802
I really like these heads. The liquid is in a sealed tank above the coil, you press the top down to pump a little e-liquid onto the coil/wick.
Puts you in control of the "juciness", so it never gurgles or leaks (unless you over-pump it). Haven't found replacement coils for these yet;
they will take the standard evod heads though, even though that's not as good as the originals. Wish the drip-tip was replaceable; i'd like these even better with a plastic tip.
All the above have replaceable heads, but they are also rebuildable (so save them; you'll probably at least give rebuilding a try some day!)
The above is just my opinion, of course, but I think any of these are very good everyday-use heads that don't require much fussing.
Have fun!
