What's your hardware of choice?
Right now with a few ecigs around me (including ego-T atties, LR and normal), it's an ego with an ego booster, with a CE2 on it. This setup really defies convention for vaping gear. CE2s have a smaller following, with the majority disliking them because you have to fiddle with them to get them to work optimally and not a lot of people got the ego booster.
I wouldn't have an ego booster if I didn't catch it on the last yo yo sale from TW. I ninja'd the heck out of the last one for well under half price. Otherwise, I'd consider it sort of pricey for its range. Mine has started to slide up at the base a little; I've had to use some elbow grease to shove it back together before it comes apart. Seems like it's put together like a really tight biscuit tin: as long as you don't let the bottom pop off it should be golden.
I'll have to get back to you on preferred gear though because my lavatube is meant to be here tomorrow. I got it because I wanted to consolidate my ego with its booster and CE2, aka the crack pipe, into one body and CE2 aka the pipe bomb. I'm really hoping the lavatube will be my answer to vv vaping.
If you can get the ego booster on sale, it's actually a pretty fantastic addition to the ego batteries. Once you've got it on there it's just not the same without it again. Take care of it though, it does seem slightly more breakable than anything else I have.
I swear, if you asked anyone else what their ideal setup was, I don't think many would be using what I'm using now lol
I prefer the CE2 because it DOES wick and it's a much better tank system than the ego-T. I cut the inner seal slots into /\'s and they wick straight vg no problem at all. I cut syringe cases for them and they are now indestructable (ran one over with a car by accident, the case cracked but the insides worked when I cut it a new tube). CE2s last months. I mean months. I've had these 4 CE2s for 3 months now. No sign of them slowing down. Just dry burn every 20 or so fills? Good as new until the wick actually falls off from just far too much use after months.
They're cheap, the coil is at the top so it's warmer vapour with better flavour, and add an ego booster, it's whatever heat you want or just dial in how much liquid is on the wick for it to vape off better. I moved straight to CE2s from the Ego-T and it was like night and day in terms of heat and flavour. Then when I started using the ego booster too it was like an actual vape related ephiphany, like wow, so this is why people say vaping is so good. I like CE2s

I hope the lavatube will be the device I settle on to use them with.
I guess I wouldn't really recommend the ego booster but until I try out the lavatube I can't say there is better available to me in the UK right now. You got more options over the pond. If you can get it on the cheap, it is a real step up for the ego I can't do without anymore. CE2s are love or hate thing. I think they were designed for vv use because you have to cut the seal for it to overwick so you need to kinda adjust the voltage for how fast or slow that CE2 is wicking for how thick that one liquid is you have in it. Kinda weird I know but it works for me haha
I think you're doing the right thing though, to try out some cartos first. Lower the ohms of the heating element and it's a ton cheaper than a whole new pv. If you like the lower ohms, you could upgrade to something like the lavatube and stick anything on it and make it hotter, like a 510 atty to drip on for like $10 or some CE2s for like $10 or just anything really, a lot cheaper than a provari!