As a guy with a small wrist myself, around 36mm is what you're looking for. I've got a stupidly thin pulsar that I love that's 34mm. Quartz, but you don't get mechanicals that thin.
You could also get wind ups from HMT on ebay, they're an Indian maker. Decent little mechanicals, great price (about $50), and simple, classic styles. Vintage anything too, of course. Most Seiko 5s are 37mm, but they do work for me.
Anyway, just a few ideas.