What kind of clipless pedals do you have? Different shoes work with different pedals. If your pedals work with SIDI shoes, that's the brand that I would recommend. They offer several women-specific styles. Even the cheapest style isn't cheap, but they will last you a long time (or so I've been told). I have a pair of Zeta Mesh SIDIs that I like. I also have a pair of (men's) Vittoria Arrows that I bought from Nashbar. I like them too, but they don't fit as well. I would recommend that you go with a women-specific shoe, especially if your foot is narrow. My LBS recommended that I go up a size too. Shop around and try on as many as you can.