I'm also trying to decide on a first tarp for a BB.
I'd like to get an OES b/c it seems Brian has the best prices on spinntex tarps. I'm having a hard time deciding between Deluxe and Ultra for 3 season use. Brian told me approx weight of Deluxe in spinntex is 9.8oz and 11.5oz for the ultra. Weights include stuff sack and seam sealing.
I guess the benefit of the Ultra's extra tie out is you can close the doors somewhat if you needed too. Downside is that the Ultra is 16 inches shorter in width than the deluxe. Also I wonder how well creating a porch with hiking poles would work with the ultra.
Finally i'm interested in catching water with the tarp and i bet i could attach one of those Hennessy water collectors (or something similar) to the middle tie out of the ultra.