Cheers buddy, I will look to order the nautilus and def want another mod so I will have a back up.Perfect. The best fit to move up to would be the nautilus 2. No need to upgrade the mod if you don't want to but it's always good to have a back up. The nautilus have slightly larger coils and similar airflow control. Very good tank indeed. Should you go for a mod there's a matching one to the nautilus called the zellos and eleaf still make good ones. I love the innokin coolfire 4 plus. Not a new mod but very reliable and a big built in battery. Plus its very ergonomic. There's so many to choose from now though.