If the optional vestibule seems too heavy, perhaps just cut and modify a piece of cuben to buckle in. When I use my bibler, I find myself only "needing" to hook the vestibule up half the time. Fortunately, the tent does not "need" the vestibule to deflect wind.
(As I might have mentioned before.)
+1 on the Integral Designs/Bibler double pole tents, btw. You aren't taking a risk with that particular type of design.
As far as the Voyager goes, I'd be cautious about a very expensive tent with zero reviews, even if its lighter than its respective counterparts. It's modified geodesic design reminds me of the old North Face Tadpole/Bullfrog design of the mid eighties. That particular design was a good three season shape at its time, but was never considered a four season shape, due to its inability to shed snow.
Besides, "If its too good to be true, it probably is."