I'm looking for an upright ride with flat bars, but an otherwise light frame with road tires. I am an enthusiast roadie but my current bike can't accept a rack or child seat and it can't tow a trailer. I live in NYC and I can only have one bike, so I want a fast, light weight bike that I can take out for 20 mile loops on my own, but I also need to be able to attach a rack or child seat so I can bring the kids.
This bike literally hangs from my ceiling in my apartment (over a desk) so as a result I'm considering all kinds of options like internally geared hubs and belt drives (for the clean factor).
For a starting point, let's use the Seven Cycles Expat S as the prototype bike I'm considering.
Looking for the following:
Upright riding style
Ti frame that can accommodate standard racks, child seats, and pull a child trailer
Possibly an integrated geared hub
Possibly a belt drive