I bought an original Nautilus and that thing leaked like a sieve. I thought I might like it since I like the Nautilus 2 so much... That tank can leak, but only if you overfill and if you don't close the airholes when it's not vertical/being used. Maybe my tank was a clone, but either way I found it to be a very different animal than the nautilus 2. You could try the Ego Mega tank, that one has decent juice size and a lot of coils (rebuildable as well as not). That tank has never leaked on me, even when I leave it sit (full). Pretty inexpensive as well. Prebuilt coils are 1.0 and the TC rebuildable coils are sub-ohm. It seems like a pretty customizable tank that's easy to use if you don't want to build right away.
Anna