I'd say if your old bike fit you well and you didn't have issues, don't veer too much from that geometry. I have e-mailed a Trek rep before (found the e-mail on their website) asking for geometry specs on a 7-year-old road bike, for which there was no archived info on their website. I bet if you can't find it on the Specialized website directly you could e-mail someone and have them send the geometry specs to you! Then, make sure the ones you are considering buying are similar in at least top tube length and standover height as atombessy says. And of course, make sure you get a chance to ride it at least a little bit before you buy.