On the 'Vari, I'm just using Boge cartos.  The photo is a ByLeo Cage tank.
I have one Sophia, but it was a little "fiddley" for me - I'll build it again soon, but with a carto, it's good or bad, and when it's good, I'm happy with it, LOL.  The Sophia, I kept thinking I had to adjust it to get the flow right...
I've also got 2 Russians I use sporadically, too.  Same thing for me - they'll work great for a while, but then I find I want to fiddle to get better wicking, etc.  
	
		
	
	
		
		
			I like your style Train.  This is basically the setup I take with me every work day.  The only difference is I use a afc Cyclone and a Kayfun.  Which atty is that on the Provari?