Sure, get the Madone. Commute with it in good weather, and use your 7.6 on other days. You have the perfect setup: a safe place to lock it at work, and a backup bike for less-than-perfect weather. Use a messenger bag or backpack; no sense in having racks on every bike.

It isn't blasphemy to ride a $3000 bike to work -- no more than driving a $30,000 car to work.