'09 Jamis Satellite Femme | stock Jamis Road Sport -- road
'08 Trek 7.2FX | Terry Cite -- commuter
'77 Raleigh Grand Prix mixte | stock Brooks (vinyl) -- just for fun!
I have a 7.2 FX also. I commute on that with my backpack on a rack. Love my bike!
I've got my bikes in my signature, and I love them both for their purposes.
The more expensive soma steel CX frame is for every day commuting, not to heavy, it can take fenders & a rack.
My grocery-getter is an old mixte, it came with fenders and after some work the LBS managed to get a rack on it.
Things I would look for in your position:
can take (or already has) fenders & a rack. I know some people like their back packs, but I can't do that. I find it uncomfortable and my back gets sweaty. Since you already have a few nice bikes, I'd go for something vintage. Lugged steel frame bikes are so elegant. I also think a mixte is a super fun option, I LOVE mine and swear I will always own at least one. I don't know what your area is like, but it's a major advantage being able to lock up my cheap bike and not worry about theft; I wouldn't care to leave my soma unattended for more than a minute.