Perfect winter commuter.

I'll bite. Assuming price is no option, and this is primary means of transportation for everything save very large items (bag of dog food), and you have no large snow events.

Ti frame and fork with braze ons for front and rear racks -- as you said corrosion resistant. I would go with Hilite's trekking frame. The Swiss know how to make stuff, and it works with the rest of my build.

Rohloff hub with gates carbon fiber belt.

Salsa Woodchipper bars with double-wrap bar tape of choice. Extra credit if you can double wrap a Bavarian braid (blue and white two color result).

Gilles Berthoud Rohloff Shifter

Hydraulic disks switched over to DOT 5 fluid (silicon-based, thus hydrophobic).

Jannd Extreme racks front and rear with Ortlieb Classic Panniers and handlebar bag in yellow or dayglo (adjust for commute length/needs).

Schmidt SON disk dynamo front hub

Busch & Müller Topline Brake Plus dynamo powered twilight with standlight capacitor for stops (or similar, I haven't run one of these since I lived in Germany -- they are awesome, but technology has likely gotten better).

Schmidt Edelux II Dynamo Headlight (crown mount), cheapie USB flasher for handlebar.

Fly6 tailight/camera -- bonus points if you can set up a charger from the dynamo for the Fly6 as well as the flasher on the handlebars, and run clean wiring using arctic-grade cable and platinum connectors.

Brooks Cambrium Saddle.

Giles Berthoud stainless steel fenders with leather mud flaps. Mount with VO's Spring Thing (or just make your own).

Pitlocks on axles, seatpost, and threadless stem topcap nut.

Abus wheel lock (to supplement your other locking solutions).

Continental Contact Winter II premium tires (700c X 42) on wheelset one. 45 North Gravdal tires (700c X 38) on wheelset II (will need an extra Rohloff... Your money is much easier to spend than mine ). Give Peter White a call and have him spin you up some Velocity OC or similar wheels -- tell him what you want to do, and let him go crazy.

All stainless Braze-on or mounting bolts

Phil Wood or SKF sealed cartridge bottom bracket. Gates crank arms.

Edit to add 45 North Heiruspecs pedals. I love these things.

I think this makes a good start on the ultimate commuter. Might add lots of reflective stuff. I'm partial to the cheap bell ugly yellow reflective tape. Best deal in cycling parts. Make sure you run some reflective red on the back fender too -- better than a cheep plastic reflector, and likely the law.