For me, the foremost concern was that I quit smoking. I didn't care if my PV looked like an analog or a car muffler. I decided to start with a Riva 510 (an eGo reproduction) with two 650 mAh batts and one 1000 mAh batt with a pass through. The 650 mAh batt is the same diameter of a small cigar.
At my age, I don't care what people "think". In fact, I am seriously considering some batts in different colors: green, pink, red, purple, blue. Point is, you have to weigh your concern about what other people may "think", which means absolutely nothing on the whole if you're doing this for your own health, against your end goal - to quit smoking.
If you really, really want to quit, you'll be pleasantly surprised to find that the 510s are not as terribly bulky as you might think, that any difference outweighs your trepidations, and that your quest to stop smoking will be a very enjoyable and effective one.
If you think you can handle getting alot of extra batts, chargers, and other supplies, make sure you have a couple of those extra batts charging at all times, and are willing to do frequent refills - and some people do - then do what's right for you. Be warned, though, that you'll probably quickly decide to upgrade. Just my very humble opinion.
We do hope you end up joining us as a vaper!