Definitely watch videos of people using the different models, if nothing else just to see what they really look like. I thought the 801 would be really huge--like a penny whistle, but it is not. It's just about an inch longer than the 901.
And definitely buy extra batteries and some juice.
I have 401s, 510s, 801s, 901s and Janty Sticks, and I do not have a favorite among them or think one is the "best." They are all good and all different.
Most people tend to like the manual batteries best. I don't have a preference in that area, but with the 901 and the 801 (and maybe others) you can get both types of batteries.
With the 510 and the 901, you can get a portable charging case that is extremely handy--unless you are only going to vape at home.
Once you pick one, learn how to use it. It is different than smoking an analog cigarette. Don't get discouraged if vast plumes of vapor do not issue forth the first day. Come back in here and ask for help if you need to--folks around here are really helpful in getting folks past the learning curve. After you get the hang of one, the others will fall into place and you can play around with other models and mods if you like.
I looked through the sponsoring suppliers and compared prices there when I was first ordering. I was never disappointed. After a while, I ventured out into other suppliers not listed in that section, and I have always been pleased with them, too. I hesitate to recommend a supplier, not because I am being overly-cautious, but because I have used quite a few (stocking up

) and listing them all would be more of a directory and I wouldn't want to leave anyone out.
Good luck! I fyour experience is like mine, within a week you will not care if you ever smoke another analog--and I wasn't even looking to quit
