Frog toggs dri ducks (sp?) rain gear was $20 when I bought it a couple of years ago. This does the trick. The fabric isn't super strong but I haven't had any problems. You'll need a band for the pant leg.

Regarding your list I would bring fewer clothes--one pair of riding shorts, one off bike shorts, 2 pairs of socks (one long for sleeping in, one short to ride in), one underwear. Long underwear are nice to sleep in if the temps dip down at night.

I am with you on the pillow. This is a wonderful luxury. I suggest a real pillow instead of an inflatable. I love the REI compressible pillow (small).