Photomom
Joye 510 manual (2-3 hours), Joye 510 with manual mega xl batteries (3-4.5 hours), or the fatetr-battery versions Joye Ego or Riva 510 (6-8+ hours and the ability to use hotter harder hitting LR parts). 510 is a 3-piece you can use as a 2-piece w/ blank cartomizers
See LiteCigUSA.net, Cignot.com and others for real Joye 510 and Joye Ego. Also some rebranders like Volcano say their models are Joye-manufactured
or
KR808D-1 manual (3-4.5 hours w/ standard length batteries) - a dedicated 2-piece, many prefilled cartomizers available as well as types of blanks. Can be used as a 3-piece if desired but it will make it longer and needs parts of other models. The fat-battery 6-8+ hour version are CigEasy's Elegant Easy and leCig's PigCig.
See LiteCigUSA.net and VaporLeaf.com for standard KR808D-1, Vapor4Life.com for colors and prefilled cartos
Those are the MOST supported 2 model lines - most accessories, most cartos, most adapters, most fat-battery models, and most popular
Juice is a whole separate thing - it takes a while to find juices that hit the spot for you. You can use any ejuice in any decent ecig. The ecig only controls the quality of the drags, the charge length of the battery, etc. I am not a menthol smoker - I cannot help you there.
Prefilled is only a small convenience - the cart of a 3-piece needs to be topped off with eliquid often. Cartomizers can be vaped longer before they seem a bit dry or a bit light of vapor and need more eliquid (to avoid singeing the stuffing and ruining the carto). Ego/Riva can also use tank atomizer and tanks which probably vape longer than cartos between fills.