Actually we're supposed to be helping Lucas, Frog.
And, Lucas, all I can say is, there is no perfect device. Yes, the decision about which mod to get first is difficult because of all the choices available so you should decide which is more important to you of these four things: battery life, method of feeding the atty, price, appearance.
Battery life - 14500 was my first 'mod' size and battery. Running parallel in the Big KaZoo, a nice, inexpensive 5v mod, I got a day away from home's worth of satisfactory vaping with cartos. I then moved up to 6v vaping as I struggled to give up anaolgs and that's when I got my first big battery mods. They're handy because you can also do 3.7v with a high mAh, long lasting 18650 (or something similar) with LR attys.
Method of feeding the atty - are you going to drip, use cartos, lay your hands on a MAP tank? Or, have you determined you must have a bottom feeder? I suggest a bottom feeder as a second mod and that you get a real - vs a WetBox (and I speak from experience) - bottom feeder.
Price - only you know what you're willing to pay
Appearance - beauty is in the eye of the beholder and you have to be comfortable whipping it (the mod) out in public
I'd go with the Puresmoker mod you were looking at originally vs spending that same amount on small batteries you're going to have to swap a lot. Their forum is very, very supportive and the device is attractive enough to use in public without embarrassment.