Nice ride indeed (+1 on the earplugs  ). Have you given any thought to tire repair kits, air compressor etc. I believe you have tubeless tires. Therefore, fixing a flat is relatively easy.
As for a GPS mount, take a look at Ram mount. They make universal mounts. Maybe you find something that fits your GPS/bike.
For rain gear, I like the two-piece Rain Man from Firstgear. I'm not much in favor of over-booties. I think they are a PITA to put on and move around in. Plus, you may find that you get hang up on various protruding objects on the bike. I prefer "waterproof" boots from the start. I have made great experience with SIDI Adventure Rain boots.
Sounds like a fun trip, enjoy  .
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Thomas
"Hey, ...I'm just ridin' shotgun" 
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