Some of my thoughts:
PAD:
This requires several nights of experimenting. Everyone is sooo different.
I used to have the POE pad on your wish list. It was OK. The 1st one leaked; POE fixed it. I didn’t like the valve placement; uncomfortable. Then I got the Torsolite http://www.backpackinglight.com/cgi-bin/backpackinglight/torsolite_inflatable_sleeping_pad.html It is much more comfortable for about 1oz more.

Before I forget, the pack you picked--- I have the similar Mariposa. Just use the $8 sit pad in the pocket/frame and take out the fiber poles. It fits very well then (when packed correctly). And that sit pad is so convenient for kneeling, sitting, using under your feet at night, etc.,

Also, for the same comfort and less weight, I use the GG Nightlite Torso http://www.gossamergear.com/cgi-bin/gossamergear/nightlight_torso.html with bumps down (3.5oz). On top of that I put an open cell egg crate pad bumps up (1.5”x11”x17” 3oz). This fills in the spaces/grooves/curves in my back.

However, for shorter trips, I have been loving the 3/4 Prolite 4 (16oz). I have found it to be more comfortable than the full length Prolite 4!

TARP/BIVY:
I was in the Rocky Mountains last year and happened upon mosquitoes galore! Ouch! I couldn’t wait to get into my GG Classic Squall. Then I had room to move and breath, stretch, relax, read, etc., I can’t imagine being stuck in a tight-spaced bivy (though it should protect).

The tarp you picked (Patrol Shelter) looks nice with the spectralite (6oz). Take away your bivy and add their bug net (Serenity Shelter)-- maybe it would be more comfortable; a nice 12oz solo shelter! But I wonder how fast they deliver? Email them. I asked about their climashield quilt and they said it would deliver in 10 weeks; too long for me <img src="/forums/images/graemlins/frown.gif" alt="" />.

On another note, that offer by Steve below (Lunar Solo), looks mighty tempting for bad weather and bug protection with room to sprawl out in.

BAG:
24oz for a 30F bag sounds good. I wonder if that’s an optimistic temperature rating though. My 850 Fill Western Mountaineering bag weighs the same and also rated at 30F. I would think the WM to be warmer since it has higher power of down.

May you be able to get out and backpack soon!

-Barry