Hard to say who's the best but a good start would be
Best E Cigarette | Buy Electronic Cigarettes | E Cig Juice - MT Baker Vapor for their low low prices and fantastic variety.
There are the premium suppliers like Alien Vision and Alice in Vapeland but those are on the expensive side
because their eliquid is more elaborated but that doesn't mean you will LOVE their creations.
I always recoemned for people to buy small qty and try to see which is best for them , some will end up loving the tobacco flavors , some will hate it , same goes for fruit flavours
. not all tobacco's are the same tough , I hate Tobacco flavour but I Love the Ry4 from
Crystal E-liquid
As for strength , I started at 12 mg and went up to 18 mg for a short while , I start getting headaches and weird dreams so now I do 12 mg during the day and 6 mg in the evening.