Consider this,
If you want to try to quit smoking and don't think you'll be vaping long, I recommend a regular 510 kit and pcc with gradually lowering your nic levels however if you're planning to switch from smoking to vaping (with or without hopes of someday quitting altogether) I recommend an eGo/ Tornado as it has much better batt life and much better performance. There are plenty of other great kits out there but from my experience this was the way to go for me. I just noticed that a lot of people recommend the regular 510 kit, when you can get the eGo for about $30 more.... Just thought I'd throw that out there as I see a lot of people making the switch from smoking to a 510, then almost immediately looking for something that'll last longer. So again, if you're not so sure about vaping, 510. If you really want to try to make it work do yourself a favor and order the eGo. That's my advice, take it for what it's worth.
All hail the eGo. It saved my life, and probably many more.