Nice to see some of the local area featured here on Flyertalk. I am a bit biased since I got married on the patio at Spirit Ridge at Nk'Mip winery in Osoyoos in September a few years back.
As you have aptly described, there are stacks of wineries to choose from. Raudz, as recommended upthread, also has a great reputation, although I tend to visit Bouchons in Kelowna proper when traveling to this area for work. The Old Vines Restaurant at Quails Gate is excellent, as is the patio at Mission Hill (seasonal).
Hope you come back soon!