I need a tank recommendation for my dad.

My dad wants to graduate up from using ego batteries. He is wondering if there is a tank out there that can use replaceable heads and also have to option to build your own coils.

I know the Goliath v2 can do this but the deck is really small and I think building 2 coils will be a little much for him at the start.

I haven't used a replaceable head in 3 years and have strictly been using RDA/RTA so i'm a bit out of the loop. He liked the look of the kanger subtanks do one of these offer the options he is looking for? He actually liked the look and idea of getting one of the Kanger starter kits but is just going to use one of my old Hanas for now.