Everyone's got the popular clearos, so I'd go by who's got good/reasonable juice. Here's two:
MtBakerVapor.com
MrELiquid.com
And I'd get a MiniProtank - I think they're the best on an Ego, and they're glass so you can vape the juice that can damage plastic tanks (cinnamons or some citrus). Those cost more - so maybe also get a couple EVODs, or T3s, and you'll be all set!