"It's easy to make a calendered SUL fabric which looks good on paper but breathes like crap (Tachyon, Ghost Wisperer, Quantum GL all fit here). Personally, I'm willing to carry 6-7 oz v. 3-4 if I can bust brush and not worry about snags."
The search for a windshirt which ticks all my boxes (decent fit, hooded, full-zip, not too flimsy, <7 oz. (200 g), decent breathability, straightforward DWR renewal, reasonable price) took me quite some time. While the first five criteria were easily met by the Arc'teryx Squamish the last ones were a bit harder to meet.
Yes, I wanted something similar to the Squamish - but made of another fabric (and a bit less expensive). I remembered my favourite shirt in terms of breathability and maintenance: an old 1990 berghaus windsmock made of a polyester microfiber fabric (a tad too burly and color design by a color-blind brit) - no calendering, no coatings, no-fuss. So this would be it - a cheapo Squamish made of Poly.
I found a decent compromise (at least for my needs) and it was a real bargain at 65 Euro (would be around $75 today, not sure if you can find it in the US): Norrona Bitihorn Aero 60 Jacket. OK, not perfect (hood without volume adjustment, shapeless brim, crappy cord locks, fraying edges inside the stowaway pocket), but well worth a look.
Just my $0.02.