Bianchi vs. Cannondale is apples to oranges. Two completely different rides. You should probably stop by the LBS and test ride a few to get the feel for steel vs. aluminum vs. composite and decide which one suits you best. As far as the indiviual brand line-up goes, most brands offer both a race bike line-up and a tour bike/recreational bike line-up. The differences are geometry and construction and resulting comfort of ride. Within each of those types, they differ mainly in quality of tubing and parts gruppos. I'd pick the type of bike and level of gruppo you want to settle for and shop from there rather than trying to memorize model names.