I didn't know the Zenith coils could be rebuilt. Do you have any links too the technique, if not I'll have to search that out. The Zentith's are our new 'fav' plug&play tank. We got all three sizes ... next step is to decide which of 'em we like best and get a few more. So far I'm liking the 3ml D22 version.
Since the Zlide doesn't close of the juice flow when filling ... any issues with minor flooding or gurgling after a refill? That annoys me with some tanks.
@Uncle Willie ... I suggest you consider the Zenith's ... folks here turned Janet and me onto them and we both like 'em a lot.
The Sigelei Zmax's are a decent mod if you're OK with a tube mod. They last a decent amount of time on the charge from an 18650 batt but are quite long in that mode. The shortest config using an 18350 was my preferred mode but then make sure you have extra batts with you because the charge doesn't last real long. It's also take an 18490 which is the compromise in length of tube and batt life.
We had a number of them (not the telescope one, the ones with extension tubes for the different batt configurations) and they compared favorable with the Provari tube mods for 1/10 the price.
I keep checking back ejuice hoping they'll restock the 1.6Ω coils. Willie if you go for the Zenith or Slide Zlide I'd suggest the 1.6Ω coils not the .8Ω coils. I think 1.6Ω coils will better fit your vaping style.
We have some of the original Pico's and they've held up well. I forgot off hand what models they are but some are the size of the Pico 75 and some are skinnier and taller. We like the squat ones better.
I suggest you consider any of the Pico's in the $30 +/- range that have been linked previously coupled with a Zenith or Zlide for serious consideration. That said, I'm not familiar personally (like w/ the Pico and Zenith) with the eGo One and CLR coils but all around ECF I've seen favorable comments about them.
Oh ... and if you're looking for really long batt life ... one of those Pico links was for a model that takes either 18650 or 21700. Those 21700 have around 5000 mAh of capacity, you could vape a couple days between charges. The 18650's are around 3000 mAh. I think the Spinners are around 1200 mAh.
Definitely go for a mod with replaceable batteries.