The colour choice discussion/dilemma is interesting ... I thought it was just me!
I've always owned the black iPhone, and have owned the 3G, 4, 4s, and now the 5s. When my upgrade came round in February I was undecided between black/space grey and either of the white models.
My wife ordered the white/gold for her upgrade at the same time I ordered my eventual choice of black/space grey. The main factor was the look of the device when at sleep/off ... the white phone with this giant black rectangle. Can't be helped, but still.
Anyway having used my black/space grey for two and a half months now and having used my wife's a couple of times I wouldn't have minded.
I don't regret getting black/space grey but the way the Touch ID sensor ring is highlighted on the white models is great and it's barely noticeable on the black.
Now I don't wish that the ring was more noticeable so people "know I have a 5s", I just think the ring adds a nice finishing touch the look of the device, something the black model sadly lacks.
Not a big deal.