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C) Keep it simple to begin with. Contrary to many peoples beliefs, I feel that cig-a -likes are an invaluable place to start. I am using an Apollo Extreme cig a like. If you like cig-a-likes or disposables then that's okay too. I have succeeded in quitting the analogues with cig-a-like's alone. Though I am now (after 2 weeks of vaping) so ready to try the next best thing with (an ego) because I want a better battery & a stronger vapor/flavor experience.
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I would like to emphasize that part about the cigalikes because it has been my experience too. I basically discovered ecigs in July 2013, and had my last regular cigarette in August 2013; during that few weeks in between I was mainly using cigalikes and especially disposables.
I probably spent about 3 months worth what I would have spent on cigarettes making the same mistake as you Riley: you got a unit using some older threading but what has become the standard now is the eGo/510 threading.
I've still got 2 "Suprecigarette" packs and dozens of flavor cartridges for it; as well as a "South Beach Smoke" one which uses some strange threading kind of the reverse threading to the 510.
You experience is not unusual, but you will get past it and in the longer term you WILL $save$ money.