R Fernandez sells some pretty nice Classical guitars with narrower than standard width necks. 52 mm is that standard width; they offer 48 mm widths as well.
http://www.fernandezmusic.com/R.Fern...ar_Models.html
Here's a Yammie at Musician's Friend, 48 mm:
http://guitars.musiciansfriend.com/p...tar?sku=621048
And, a more affordable Cordoba Fusion, 47 mm:
http://www.amazon.com/Cordoba-Fusion.../dp/B001RTTCPC