Just got home from my 4C.
Instead of "blasting I-10 to Cali" I'd recommend you check out US highway 90. Take your I-10 route to San Antonio and jump off on US 90. It may add a few miles to your trip but it is so much easier on you and the bike (no semis and their damn afterdraft). It rejoins I-10 at Van Horn, TX, about 100 miles east of El Paso. Very fast, clean road, just enough towns along the way to keep you gassed and hydrated.
Del Rio is a large town with plenty of cheap and clean motels, eateries and a bike dealer or three. The small burg of Marfa, TX, is a freakin' hoot. If your schedule allows, please do spend a night there at the El Paisano Hotel. If not, schedule lunch at the Futura Cafe. Yow. Best meal I had on my 4C trip.
This route parallels the Rio Grande for many miles, so you have a chance to be entertained by the Homeland Security gang chasing after illegals. I stopped at one point to watch some Bell Jet Ranger flying that I haven't see since my Army days.
Once you get to El Paso, look for the 375 Belt on the eastern outskirts. This is a freeway/expressway that cuts through Fort Bliss and takes a mountain pass to the north of the city and re-joins I-10 near the New Mexico border, and bypasses the downtown crap. For a four-lane it's a nice road, and the brief climb in altitude gives you some relief from the heat.
Once in New Mexico, recommend getting off I-10 at Lourdsburg and taking US 70 west. Again, great road, very little traffic, fast, and way easier on you. At Globe, AZ, hook up with US 60 into Phoenix, and there you can join I-10 again. Take I-10 EAST - don't worry, it seems like you are back-tracking but at this point I-10 runs nearly north and south) to AZ 347, which cust across country to I-8 which will take you into San Diego.
For the trip north, recommend US 395 from San Bernardino, CA to Lakeview, Oregon. Then OR 31 to US 97, and north into Washington at Yakima where you tie into I-82. This joins I-90 at Ellensburg, which joins up with I-405 in the burbs of Seattle, north to I-5 and north to Blaine. Taking I-5 all the way SOUNDS faster, but this way is actually just as fast, is shorter (it is) and way more scenic. It also routes you through Nevada (Reno) which is a neat place to spend a night. I live in Seattle and before I retired my job would have me sending much time in Irvine, CA. I often took my Corvette on this same route rather than flying just for grins.
Hope this is helpful.