"Rebuild" project - not really, just an upgrade. New disc compatible wheels and some front Avid BB7s to my MTB, and putting on Nokian tires (240 studs up front, 160 on the back). This will become my dedicated winter/wet bike. It's currently my main commuter but doesn't have disc brakes and runs on 26x1.25 slicks. One day I'll get a Surly 1x1 fork to replace the heavy stock Suntour front shock, and then after that I'll maybe even re-do the drivetrain to have wider gearing and no FD. Maybe 1x9 or 1x10.
New commuter bike - sometime in 2012 or beyond... a lightweight drop bar disc road bike. I'd want 105 or similar or better. Frame material undecided, but titanium is my preference right now. Must have enough tire clearance for 700c x 35 or wider and full fenders. I'm sick of my commuting choice being a 30 lb MTB or a 20 lb 700c x 23 aluminum bike, and I want to be able to ride light trails. Something like 50/34, 11-28 gearing.
So what kind of gearing does your 20 lb 700c x 23 aluminum bike have? 50/34, 11-28 gearing is what most 20 lb 700c x 23 aluminum bikes have isn't it?