I'm just waiting for my first Northern Lights, so I can't comment on those (everyone else has done that already!)
When I was choosing my first nappy purchases, I went for some Swaddlebees OV which fit your specification perfectly.
I went straight for the medium, which they say are from 12lb, but we were using them from about 11lbs
We've had no problems with them with BF poo containment, but to be honest, it's mostly down to the wrap anyway
I've been using either ME Rikki wraps or a ABC Swaddlebees wrap (These come in plain, single colours and do fit lovely over their own nappies)