Are you looking for race bike geometry or a more performance oriented recreational/touring bike? I wouldn't rule out accomodations for at least a rear rack on any bike I planned to commute on. Whether you actually put a rack on it is another story, but I know that if I CAN'T put a rack on it, I'm not likely to ride it to work.

Test ride as many bikes as you can, and try to determine the most comfortable size and geometry for you. Pick the frame that best fits that criteria. All the build components and brand should be a secondary consideration to fit and comfort.