I would recommend you check out this thread for a lot of great information. My link
I realize that you are wanting one that mimics a real analog... but please, do some research before you decide to go that route. There are a lot of great units out there... and all of them have different pros and cons. Please read all the reviews you can on the eGo ... it has exceptional battery life for it's size and is very well built. It works great with 2.0 ohm cartomizers, which is how I prefer to use it, or atomizers if you so choose. There are a lot of reviews here and on YouTube to get plenty of good information. There must be something great about it if you have to search high and low to find something negative about it. The only thing I would say is if you went with an eGo... just go the safe route and buy a genuine Joye eGo and not a knockoff. Totally Wicked sells the Tornado, which is the same thing as the eGo, only re-branded for them. There are plenty of knockoffs out there, and some of them are ok, but we know for sure that the genuine eGo is good.