I would recommend a DSE084 model... 84mm lenght like a real cigarette ...
Maybe it would be better to buy some spare
batteries (the weak part of this model)
60-70 usd are enough to start using this model with some spare components ( prices on ebay).
I don't like very much 401 (or 402 403) smoore models... i don't like the atomizer... it makes lot of noise... toooo much vapour... and the taste is not so good... (according to me)