I really like WB Socks- http://stores.shop.ebay.com/WB-SOCKS...34Q2ec0Q2em322

I have 21 inch calves, and they fit well. Not to mention the fact that they're cheap! They're great, especially for the price.

You could also give these a try:

http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT

I've been wanting a pair for a while, and will be getting one soon myself.