I will comment on the ventana and the viper non hd.
I was able to play with the ventana you mentioned and a viper non hd 15-45x65 in the store reading barcodes off boxes at 84 yards. For wha I got to see the viper edged out the ventana by a little. Not a lot. I purchased the viper and have no issues seeing .223 at 200. On days with little mirage I can see .30 cal holes at 300 (non shoot and see targets, but in the black takes a minute to find. I now draw targets by hand on bright orange paper and the holes are plain as day.) But that's a lucky day kinda situation with any spotting scope at 300 and beyond. So back to your question I would buy the viper hd if you got the cash. I bought mine when they went on sale for $300 and didn't see the need for dropping the extra coin.
