Thanks for all your advice

The bike I'm looking at is a '08 Trek Madone 5.1 WSD.
Crank: Shimano Ultegra 50/34 or 52/39/30
Cassette: Shimano 105 11-25 or 12-27 (triple), 10 speed

My current bike is a '07 Fuji Professional 2.0.
Crank: FSA Gossamer Mega Exo, 30/39/53 teeth
Cassette: 10-speed, 12 - 25 teeth

I was happy with my Fuji until I got up off the seat the other day as I was going up a steep hill and almost lost it. I was in low gear and the crank just gave up. My husband fixed it and has ordered me a new crank set because the one I have is marginal.

I think staying with a triple is probably a good idea!