The 2100 is a good bike, you're lucky to find one actually! Trek's supply chain seems permenently messed up here in VA. I'm guessing you're 5'6" or 7" since you're looking at a 54. You may want to try guys bikes too! I ride a mens frame and love it. Don't limit your test riding to WSD bikes.

As for where are the women? That seems to be the question of the year...I know I can't find many.

I was a runner too, then I fell in love with the road bike and quit running. I may do some over the winter as cross-training for the bike, but the rush of my first road race has me totally hooked on the bike. I did a marathon last fall-not too bad a time-but for some reason I just love the bike so much more now. The cycling community is also much more positive for female body image, I hated looking in the mirror when I ran, now I'm quite happy with my body's function and appearence.

OTOH, the cycling community can be really hard to break into. It sounds like your DH is into it, so that may ease the way for you some. Be persistent with group rides and such, it takes time to be accepted by the guys.

Have fun bike shopping!