I'd get the white ones, or better yet, get silver ones. I've seen the silver ones in, IIFRC, Gempler's catalog.
Yeah, they do cost more, but you'd be surprised at how much better light colors reflect light. I use the blue (and green) tarps for all sorts of things, and I've had them up as partitions in buildings. Not much light got reflected off them, despite their shiny surface.
Sounds like you're getting your place well set up
