Geekvape Ammit MTL looks interesting, has top airflow to help reduce leaks. And building looks easy, especially if using single strand wire.
No experience with it at all, sorry.
Only been viewing pictures and the machining doesn't look the same quality as GV, a reviewer had issues getting one apart properly and ended up damaging it doing so.
Like I say to folks though, it's a pity that you can't try vape gear before you buy.
If you liked the airflow & draw of the Nautilus, the Berserker is probably close - I gather it can go very tight. I have no idea about the others.
Just to add to your confusion, there's also the EhPro True MTL tank. It's pretty nice and fairly easy to build for. There's a thread for it here. Oh - the Doggystyle clones are popular too!
Take your time and look at as many images of the build decks as you can and ask yourself, can I work with that?
As at least looking doesn't cost you anything.