There's some good suggestions here. Before you purchase, though, I highly recommend that if you want to be self sufficient (and not go broke vaping) that you grab up a clearomizer that can easily be rebuilt. This will also protect you from any changes in laws (FDA bans, local laws, federal bans, etc.). Check for vids on how to do it first (on YouTube) and decide from there. Price may also be a factor.
I'm oldschool at this point, so I still use the (tried and true) Vivi Nova Mini, although there are several newer options. The cost of buying replacement heads is utterly ridiculous, as is filling up landfill space with stuff you can re-use ad infinitum.
I like the Vivi Nova Mini because it is one of the few tanks that you can get a metal replacement tube for (I know Vaporbeast sells them), which makes it virtually indestructible, and doubles as a blackjack so you can club people for vaping cash in desperation.

I know I've broken a couple of tubes in my day from drops. Then the center post gets out of alignment on the tank, so you manhandle it to straighten it back out, and then BAM! Tank cracks. Not to mention some juices (especially of the citrus variety) can melt the plastic which ruins the tank (not to mention what awful chems you just mixed into your juice with melted plastic).
At this point, they are all seemingly coming together to become relatively the same unit, with minor variations on a theme (flavor, vapor production, top/bottom coil, rebuildable/not rebuildable) that can often be modified by what wick/coil you use to rebuild it with/what juice you vape. It's good to see the industry kind of hit a level of standardization, but sad that it's not really advancing any more as quickly as it used to.
I'd also recommend that you stay away from all metal entry level cheap rebuildable atomizers from China until you do some (very) thorough research (youtube and ECF are your friends). Some of them work out, but some require modification (drilling a bigger air hole, sanding, etc.) to be worth the money. Some are really hard to rebuild and not worth the effort, as well.
You may also want to get a cone adapter so as to improve the cosmetic streamline factor of your e-cig, no matter which tank you choose.