Pack: Ask for suggestions in the forums and you'll get plenty. I think Golite has a 40% off coupon still going (search Gear Deals)--if you can find your size in stock, you could get a Jam for $90. Haven't used one myself, but many seem to like it. At 27 oz, it's not the lightest, but is about half what you currently carry and can be trimmed some.
I repackage Aquamira in trial-size bottles of visine (about 1/4 oz size). There are places to buy little bottles online, but with shipping cost and wait time, I find it easier to buy the trial bottles, dump out the contents, and reuse. You need to recalibrate drop size tho. I use slightly larger reused dropper bottles to repackage DEET. Mike C!'s book tells how to make dried toothpaste dots--I used to take a mostly-used trail-sized tube of toothpaste, but now use a teeny tube I got from a hotel in Japan (can be refilled). My toothpaste + cut-down toothbrush weigh 0.2 oz together, which makes me unreasonably happy, considering I'd prob. never notice the difference between that and 2 oz when packed.
The needle stake seem to work fine--I didn't exactly research them, just bought the lightest I could get locally. Haven't used them very long. Cross section is rectangular, so they hold better than round. MSR and others also make stakes with Y or X cross-sections, which hold very well.