Is there any compelling reason to ride a titanium bike for commuting rather than steel?

I ask because I'm thinking seriously about getting a custom bike, and I'm agonizing over material choice. I don't want CF or aluminum; I love the feel of steel. My LBS is giving me a quote on a Seven Alaris, and they *really* are pushing me towards titanium. I've ridden 7,000 miles so far since last September, and they say with that kind of mileage a titanium bike is well worth it.

But I've also had my eye on the Co-Motion Nor'Wester, which looks like a pretty gorgeous steel bike. It would definitely be much cheaper than a similar titanium bike, but my LBS isn't a Co-Motion dealer, so I think I'd have to go through somebody else (sad!). Weight is not that big a deal for me since, as a commuter, I carry loads of stuff with me all the time anyway.

This bike would be both a sturdy workhorse commuter and my bike for the 100-mile rides I've fallen in love with. I'd ride the STP and all the long training rides on it. So for that I'd like as light as possible, although with commuting weight isn't such an issue.

Help!