It depends on what you want to do with it in the future.
If you are wanting something you can change things around a lot on, like lots of options for tanks and other parts then I would suggest an Ego-based starter kit like the EVOD, or Joytech. (Personally I would recommend Joytech since they have fewer problems.)
If you're not worried about changing parts a lot, and just want a simple, easy to use, and ultra reliable starter kit I would HIGHLY recommend the Halo Triton. There aren't as many options as far as 3rd party parts go, but you really don't need them because the Halo parts are really really hard to beat. Their parts are all designed specifically to work together, and they've got really intelligent designers.
I'll give you an example here.... Virtually every top burning clearomizer you find on the market today has a hole in the top of the coil that you have to be careful not to pour any liquid down......... But not Halo. Halo did something remarkably smart and remarkably simple, they made the coil longer than the tank so it's virtually impossible to get liquid in the top unless you're doing it deliberately. Their batteries also last a lot longer than your typical Ego battery with the same mAh rating.
They cost more than your typical Ego but there is a reason for that. Superior design and superior quality. Still relatively cheap though, $65 for the starter kit which comes with 2 batteries, 2 tanks, USB charger, and wall adapter. It's also compatible with all of Halo's G6 parts and any 808D threaded parts on the market.