I would highly suggest the
Wide End Cap. It could be just me, but I have a fear of knocking over my Provari, so hopefully this will help. (have a new puppy and a six year old, and a clumsy wife, hehe)
I ordered a pro ring from Loki as well, to ensure my tank looks fitted.
So I took a look at the starter kit, and realized you are better off buying the red Mini separate, and then your batteries, tank, and charger from other vendors. I got an XTAR WP2 charger from Amazon (prime) for less than anywhere else. It comes with an ac adapter and a car charger, and it recharges A LOT faster than my cheapy chinese charger I had from long ago.
Regarding batteries, I am always afraid I am going to get knock offs, so I have been sticking with
RTD. Their prices are competitive, and their batteries have all be authentic for me.
For tanks, especially starting out, please learn from my mistakes. I have spent a bit of money in the past few weeks trying this out, that out, etc. I can't recommend the iClear 30B from Innokin. It's a dual coil, bottom feeding clearomizer. It vapes very nice, with great taste and vapor production, and is reasonably priced at $16 at
Mountain Oak Vapors.
All that said, you can't really go wrong with the starter kit. I don't really like the protank 2 now that I have the iClear 30B, but it's not terrible. (do NOT take out the extra flavor wick unless you rebuild your coil, it will simply make your protank 2 a gurgletank 2)
Gluck, and welcome!