Now, you've touched on a combo that is VERY near and dear to a lot of hearts, here on the ECF...
A Provari and Kayfun/Russian is hands down one of the most potent vaping setups available. Pretty much any combo of any version/generation of each will be right.
Now, with this setup, you get new territory. With that territory, comes lots of "advice" and build tips from people. Be ready to take that info with a grain of salt.
That being said, I've got a build you may be interested in...
After years of playing with these Kayfun/Russian devices, I've found my nirvana and I'd like to share.
I use 28g Kanthal, and I wrap it around a #6-32 machine screw (I got the 2" long ones so there's plenty to grab onto). I wrap it 5.5 times, starting with the wire on the "away" side of the screw.
This yields me a 1.1-1.3 ohm coil, and the diameter allows for great wicking. Once it's installed on the deck, I position it about 1mm above the airflow.
I fire these coils at 10 watts on my P3, or 3.4-3.6 volts on my 2.5 models.
Also, if you're interested, I've use the following article to get my Kayfuns to sit flush on my 2.5's, with the Tatroe beauty rings I bought back in the day from Cigtechs. It apparently works with the SM rings too.
Here's the article:
http://ukvapers.org/Thread-How-to-shorten-the-Kayfun-Lite-centre-pin