I've recently purchased a Sigelei Zmax V3 Telescope and have had nothing but praise for it. In kit versions (clearomizer, batteries, charger, presentation box) that could top out your budget, but the mod-only sales are in the high $50 to high $60 range (even cheaper if you can find a sale and/or coupon).
My wife is getting tired of swapping out her eGo's for recharging and is even interested in one for herself.
It is solidly constructed, OLED-screened, telescopes (to take batteries 18650, 18500, 18490, or 18350), shows plenty of data and the menus are easy to navigate, adjust or set-and-forget.
The image shows the difference between the flat-head and round-head models as well as the telescoping range that both models have.
There are a LOT of good choices out there, and die-hard fans of each one. I like mine, but will just offer this for your personal consideration and to "complicate" your decision.