It's interesting that you like the sound of the puff counter. On my MVP v2 I have always ignored it.
I also have a 20w istick and a Smart20 (iStick clone). These both work brilliantly with the nautilus Mini. 20w is a lot of power (whatever you may read on the forum) for normal vaping. The iSticks have the advantage of a small, convenient form factor which makes them easy to cart about with you (mine lives in my shirt pocket with Naut Mini on top, next to a 30ml bottle of liquid - I top up a lot!).
Whatever you decide to get I don't think that you'll be unhappy with these.
Whatever you decide to get I don't think that you'll be unhappy with these.