It seems like you’re partial to bivies. I used to prefer them, as a weight saver, until they came out with solo tents that weighed under 3 pounds. Back then, a tarp and bivy setup also weighed 3 pounds, so the extra volume made the tent a no-brainer.

Rab bought out a company called Integral Designs a few years back; they kept ID’s products. I used an ID bivy once that I really liked (can’t remember the name), and they have a number of bivies on their website, plus tarps to go with them. They also offer single and double wall tents.

You might also look at the Black Diamond Bipod bivy. Outdoor Research also has a line of bivies, but I’ve never heard really great things about them. I’ve never used either brand, and can’t really give you any insight.