The Viper is a good choice. I had one and in your price range it is one of the best 12x50's around. The Vortex's are MIC now so check it out good when you get it. Mine was fine but there have been reports of shoddy QA. Vortex has an Unconditional Warranty also so even if you drop it off a cliff they will replace it. Hunter's love them for that!
I have got the Viper HD now and it is indeed a nice piece of glass. A good clear view with only a trace of CA and sharp almost to the edges. The focus is a little stiffer than on my Zeiss but evenly so throughout.
It says "Assy. in Philippines" on the binoculars so I guess they are not all Made in China. The components might be though.