Look up posts from user 'markhr' and check out his comprehensive list of "drop bar, disc brake road bikes".

From what it sounds like with the debris and rough road sections, a sport-touring type of bike or a CX bike will work really well for you. Some things to consider before making a purchase:

- Flat or drop bar. (Drops are more comfortable in the long run, IMO, because of the multiple hand positions)
- What's the weather for your commute? (If it rains a lot, make sure the bike can clear a set of full fenders)
- Frame material. Aluminum can be a harsh ride on rough roads, but if you have wider tires that will smooth things out. Aluminum is good for the rain because it won't rust. Steel is good, but make sure you treat the inside of the frame to rainproof it.
- Tire clearance. Since you're on rough roads, I suggest looking for a bike that can clear 32mm or 35mm tires with full fenders. This will let you soak up the rough roads and ride over worse debris than you could on a narrower (25/28mm) tire.