booties don't cut it for me, my feet still freeze.
the only solution for me was a pair of winter cycling boots, a couple sizes larger than my normal shoes, and a mix of different socks(wool, fleece, neoprene). feet aren't toasty warm, but they aren't uncomfortably cold, either, and I was able to do quite a few 2.5-3 hour rides last year in temps down in the mid 20's.
I got a pair of Northwave Celsius boots from
http://www.gearandtraining.com/index.asp