I've only read the first post of this so apologies for repeats. Space blankets really arent warm, certainly non breathable nylon is basically comparable, and if you bring it as a tarp more usable.
Compasses are useful, but I know alot of people who are never lost as long as they have a map, the sun and north start can be used to approximate direction as well, and when your suddenly cliffed out by a waterfall, I'd probably say "thank goodness I have this map" not "good thing I have a compass"
definatly bring an extra light, I've lost mine, and out of all things easy to lose, maybe a light and the last pair of gloves/socks/hat, is the worst.

