aegis legend. Lots of folks like their Zeus tanks.
Others can fill in the blanks tank-wise as I'm a fan of Zeniths, which are meant for mouth to lung.
Their local store (fat panda) has the Aegis Legend. It's what I would have recommended if he/she wanted to go in store to purchase.
They also have the Triade 250C if we want to get unrealistic.
If we want to save money, fat panda has the istick pico 25 on clearance:
Eleaf iStick Pico 25
I'd reuse the tank that came with the Smok mod or consider a Uwell Crown 3 or Crown 3 mini:
UWELL Crown 3 III Tank
UWELL Crown 3 III Mini
For MTL they have the Nautilus, Nautilus Mini, and Nautilus X. Seeing as he/she is coming from a Smok mod, i'm assuming he/she wants DTL.
Otherwise, i'd get a free mod from Dashvapes:
Alternatives to Smoking & Cigarettes | Quit Smoking Methods | DashVapes - US at DashVapes.com
or maybe something like the Nunchaku:
Uwell Nunchaku 80W TC Starter Kit (Metallic Green) - US at DashVapes.com