OP, another thing to consider is that bikes are often sold with gearing the manufacturer considers appropriate for intended use. For example, a bike that comes with 52-36 and 11-30 will also likely have a "race" or more aggressive fit. A bike with 50-34 and 11-32 might have more of an "endurance" fit. Since you have a source for parts, switching out a crank may not be a big deal. However, if you get a frame with too much saddle to bar drop than you are comfortable with, you'll be stuck with a huge stack of spacers or some other kludge that you will regret.