The MVP v2 is pretty excellent, imo. As long as you don't find yourself wanting for higher wattage it should serve you pretty well for the long haul. I'll be the voice of dissent, though, and say that the iClear 30 is a completely alright tank. It probably won't be anybody's #1 choice, but I've been happy with the flavor and vapor production out of it. I also find the mouthpiece pretty comfortable. I consider the iClear 16 some hot garbage, though. So if your choice is between a starter kit that includes an iClear 30 or a couple of iClear 16s my recommendation would be to go with the former.
All that said, for supplemental tanks I'm a fan of the current round of Kanger tanks simply because you could have a number of different models on hand all using the same coils, which I find extremely convenient in terms of keeping stocked with fresh spares.
Can't speak for the Nautilus Mini, but people seem to adore it!