Ok, longer post. (I woke up before the kid)
I had a friend from Baltimore when I was stationed here at NAS Whidbey Island. He absolutely loved it and dreams of moving back. Friend from Texas (same situation) talks endlessly of moving back as well. Both people fell absolutely in love with the mountains and the outdoors.
I have no experience outside of San Antonio, but there are an "above average" number of bases near by. There is McChord AFB, Ft. Lewis Army base, Naval Sub base at Bremerton, Naval station at Everett, Naval Air Base Whidbey Island, and an Air Force base near Spokane.
There are probably more colleges than I could list here, but a couple would be WSU (you already mentioned), University of Washington, Seattle Pacific University, Pacific Lutheran College, Western Washington University, Central Washington University, Gonzaga, and then lots of community colleges.
I can't compare the cost of living to where you live, but I can say that the cost of living was lots lower when I lived in Texas, but so was the money I was making. A couple examples:
A waiter in Texas makes $2.32 an hour plus tips, a waiter in Washington state makes $8.50 an hour plus tips.
In Texas I was making more than $10 an hour less than I do now (basically doing the same job for a different company)but the house I'm living in would probably be sold for $100k less.
The weather is "big deal" for some and "no big deal" for others. My buddy from Texas never complained once, where a friend from the UK cried like a sissy girl. They say it "rains" but a better description would say it "mists" constantly. Just enough to make the roads wet and to let moss grow on cars that weren't washed for 3-years.
I know absolutely nothing about the Rally-x scene. I would ASSUME there is a crowd, and I would ASSUME it wouldn't be too far from the outlying cities (like Auburn, Bothell, Tacoma, -ish) but I couldn't be positive. I DO know that the nearest auto-x is about 35 minutes from where I live in Tacoma, but I've only been back for a couple weeks so I haven't had a chance to see the crowd.
From what I understand, there is a bit of a "car hating culture" centered in Seattle. Sounds reasonable as there are a lot of hippies and yuppies (read: the overly smug section of smart car / prius owners).
If you want a great idea of the weather then visit in the spring. If you want to fall madly in love with the state and be shocked when the clouds roll in around late Autumn then visit in the summer months (June, July, or August).
I would say the main appeal of Washington is the ocean and the Cascades (and the outdoor options they offer). City life here doesn't bug me as much as I thought it would, but I think I would do some research as to where I live versus where I work to avoid the traffic. I got lucky and found myself heading in the opposite direction of traffic, but when I worked in Bellevue, it took me over an hour to make it 8-miles down I-405 from Bothell.
Whwew! Hope that helped!
-Bill
I almost forgot. Lots of micro-breweries, liquor is sold in grocery stores but there's a 20% tax, and weed is legal.