there are so many coils for that tank, the rebuildable head, I run at 50w, the single coil head I run at 55w. Some of the coils I need to run at 100-125 watts.
Really it depends on how cray you wanna get. That tank is great from the aspect that you can literally vape any way you want with the one tank. From mouth to lung, to high power direct lung.
that said, Technically, any mod you buy, can run something on that tank. The vtc, shuld be able to run the single coil and rebuildable head just fine.
personally I use dna200 mod. I'm not so sure that you want to start playing with triple 18650 mods yet, but if you do, the rx200 is a god one. Also the Ipv5 is said to be pretty good, or the eleaf tc100 all are inexpensive options.
edit, ive had zero issues with mine and its run fine on everything from a mechanical, to an eleaf100 to a dna200. Not that I'm a tfv4 whisperer or anything, jut sayin.