I am all for a nanny first and then day care! As most of you have already said, it's a personal choice and a very difficult choice to make. For me personally, i chose the nanny option as i didn't want my kids to have to "share" their caregiver with anyone else, yes i know that sounds selfish, but i couldn't wrap my mind around how they can get 100% attention if they with more babies. My son now 4 years started creche at 2 years old. My daughter 9 months is home with a nanny and will start creche at 2 years as well. On weekends we make an extra special effort to go visiting, go to fun parks etc to get the kids out and about.
Having my nanny Mavis has been a true blessing

She not only cares for my LG, but also tidies up the house. Everything is spotless when i get home, no pressure, no stress. I have more time to spend with my kids playing on the floor when i get home, so nothing is a rush to get done. My food is going on the stove and within an hour all is done. My MIL and Mom is retired and they pop in during the week unannounced to check on baby, i always get good feedback that whenever they visit, K is happy and playing and the nanny takes good care of her. Oh another bonus is that if my son is sick and can't go to creche, he stays home with Mavis as well. He loves her too bits and often wants to play truant and stay home with K and her...too cute!