Nothing against single speeds but they'd be useless for commuting here in Co. Springs, too many HILLS!!! I also don't see any real advantages of these multi-thousand dollar machines over a nice 400 to 1000 dollar hybrid seems a bit too much Chic and not enough utility, jmho.
2011 Jamis Allegro 1: Weekend/Distance
1995 Research Dynamis Coyote Two: Utiity/Trailer Tugger
Take care, Ride Safe, have FUN!