Ok, so let's assume you want, in order of priority, 1) to improve your cycling, 2) to stay at the same, or lighter, bodyweight, 3) to get stronger.
If you're training for centuries and crits, you're not going to get much bigger, no matter what kind of training you do. You're a naturally lean dude, and you're simply burning too many calories and doing too much distance training to maintain significant mass. You can still benefit from heavy basics like deadlifts, overhead squats, and other movements to strengthen your trunk.
You might want to check the CrossFit Endurance site for some more ideas. Some of those folks have combined CF workouts with some endurance-specific training. And read Paleo Diet for Athletes (Friel/Cordain) if you haven't already.
"It should be more like birthday party than physics class." | Log
| 70's Big