First, get a cheaper pair of rims for commutes. Fancy aero rims will DEFINTELY make your bike a target. U-lock are great, but a thief REALLY opn top of things can break them quickly. Keep your bike from drawing attention if you can. I know a enw pair of rims is $$, but it'll be worth it if you don't have to buy a new bike. Also, see if the Police have a registration program so at least you'll get it back if stolen...

The best thing would probably be to get an mtb for the commute and save the roadie for dedicated riding.

As for the weight, I know it's hard, but OregonBound has a point. What doesn't kill you only makes you stronger and you WILL fly the first time you ride w/o the lock and backpack As for leaving it locked in a certain place, sounds like a plan to me. I did that and it worked for a full year until someone hit the parking meter pole, knocking the meter off and someone absconded w/ the lock! Ah well