e-Power, but maybe the e-Power is too fat or doesn't come in a color you like or something, so it's not an earth-shaking issue. (Maybe you haven't seen the more svelte 16450 e-Power?).
Good idea not to get large bottles right off the bat. I would say get 5ml-10ml samples. It stinks getting stuck with 30ml, or even 15ml, bottles of something you don't even like. The TastyVapors "doubler" thing is a great deal if you already know you like a particular flavor. I'm not sure if they do smaller sample sizes, but it might be worth a look because if you do find something you like, you can end up with a good amount of juice for a good price.