I also live close by, up the I5. I've been running 19" Dunlop Wintersport 3Ds for 2 seasons (235/255 stagger), and will be switching to 19" Blizzak LM60s this season (with 255/275 stagger) on my OEM 220s. Just ordered them today from Tire Rack, $1272 + shipping.
I'm not in the mountains all the time, so I'm not concerned about staying on the skinny side for snow traction. If I was, I'd stick with a 235/255 stagger.
2011.5 E90 Dinan M3, SS II, M-DCT, EDC, M Drive. 20" MORR VS8.2, 255/30 285/30
Performance Mods: Dinan stage 1 suspension, exhaust, intake; TTPs, BPMSport stage II tune; V1
Cosmetic Mods: OEM CF splitters, mirrors, center console; Arkym CF diffuser; OEM Edition grilles; IND painted reflectors/side gills; LUX; LED interior; tint