I would probably go with a pair of 1000 mah Ego Twist batteries. As for the clearomizer, that always ends up being personal preference. But I would probably go with what gets the most recommendations, like Vivi Nova (mini) or Kanger Evod. But the guys at Nashville Vapor have everything and will tell you what is getting the best reviews. However, I can just about guarantee that you will end up experimenting, just like everybody else does, and you will try two, three, four or more different clearomizers over time. And honestly, that's the only way to find what you like best.
Now per your original question, if I had $100 to spend, I would get the Innokin Itaste SVD with iClear30 clearomizer (6 wicks!). That thing is a MONSTER! Big J bought one and loves it. It uses replaceable rechargeable batteries up to 2250 mah, and has both adjustable wattage and voltage. The big downside is size. This would be my "home" unit and not considered a "travel" unit.