Some knar routes:
The Northeast Ridge of Williamson. Would undoubtedly be an epic ordeal. I have heard it could be Grade VI in winter. Checks in with Himalayan proportions:
Trail Head to Summit: 8000 feet
Total climbing vertical: 11, order 000 feet
Round Trip: 25 miles
East Face of Whitney, Grade III, 5.6
Full Northeast Ridge of Lone Pine Peak, Grade V, 5.6
East Arete of Mount Humphreys, Grade III, 5.4
Tahquitz would be a good place to start working on winter climbing techniques.
Cardinal Pinnacle has an easy route that goes at 5.6 for five or so pitches that apparently makes for a nice mixed route under winter conditions.
Coming up with hauling sytems and quick aiding techniques will enable some of the bigger routes to go. The key to success is to climb at much as possible in boots and gloves which is not easy. Often, the second may jug difficult sections to avoid changing footwear. All of this takes time to get your systems running smooth. Learning in the mountains is not going to be the best idea. Working on some of this stuff locally will be essential.