Big difference in $20-$50 to Kick mod(s) you already have, and $150+ for a new ProVari.
The Nemisis/Chi You/King/SingRay/etc. modular style makes a good low profile Kick platform. At less than 11cm long (and 22ish mm diameter...perfect flush mount with things like the kayfun style tanks) you can regulate an 18650 and get adjustable air flow built into the Nemisis style mod (useful if you've any bottom air fed toppers). The Evolv Kick 2 version is also pretty powerful and flexible (15w and can take atties down to 0.5 Ohms). If 10 or 12 watts is enough, you can find similar form factor regulators for as little as $12.
I have nothing against a ProVari, but if you like and want a regulated power source, and have a mech or hybrid (no regulation built in) mod you like, the Kick 2 is well worth the money.
I'm just saying that if you want a regulated device, and you're considering between a mech and a Provari and price is not a factor, you might as well get the Provari rather than have to fiddle with the Kick.