I hear you about burn out. I've had to really expand my horizons and try to learn more of the DIY side of vaping. It can be and IS expensive when we buy all our toys and gadgets that we vape with. But that's the thing, sometimes for me it's the simplest methods of vaping (not necessarily the simplest vaping method) that is what works for me.
I had an iTaste for a while along with several other VV/VW mods and they all would either fry out or burn out the batteries quick. I was finding that one minute the units would work great and then a pin would disconnect from the board and it would be a brick. I finally decided to get a Nemesis mechanical mod. It's simple, it's darned near impossible to break. Since then, I guess I could fund a small country with what I've bought in mechanicals.
I tried the Kick unit for a while with the mechanicals, and it works great if using something like a Protank, Protank II, or other atomizers, but then I ran into a problem with it when it came to me using my Rebuildable atomizers and drippers, it just wouldn't fire up any more.
I like using rebuildables for the simplicity of it. YEah it's a small investment at first, but after you get the hang of coils and working with small screws that my big hands weren't designed to touch, it's fairly easy and cost effective.
For juices, I have to hop around. I'll go with something very sweet and citrusy at first, but then maybe go to a tobacco after that. To me, an all day vape can't happen, I get burned out on it and it doesn't taste the same, it's different and loses taste. So, I switch up. I've found a lot of the smaller vaping companies offering cheaper solutions to their eliquid are really good. Mount Baker Vapor, Lucky 7, High Desert Vapes, and Killer Juice all have really good cost-effective mixes unless you want to do your own. There's some great deals out there for finding the deals and discounts. Check vapingcheap.com it's a great site for deals and you can find juice discount coupons and gear coupons there that really help out. Hope this helps.