Buzzy is correct, different strokes for different folks. My only suggestion would be to go with something that has long battery life. I think you'll find as time passes you'll end up with multiple devices anyway. I would scrap the 510 idea, the eGo IS a 510 on steroids, the only difference is the battery life.
As Buzzy said, you might not like a certain atomizer but love another. Mainly what are your concerns? Battery life? Vapor production? I've never used an 808 so I can't speak for those but my 510 got me off analogs.
As Buzzy said, you might not like a certain atomizer but love another. Mainly what are your concerns? Battery life? Vapor production? I've never used an 808 so I can't speak for those but my 510 got me off analogs.