Ya it would be nice to know exactly what you are going to be using it for.
I had a Vortex Viper HD 15-45x65 but I recently found an awesome deal on the Razor 20-60x85 and had to buy it. I can honestly say that it is a night and day difference between the two (almost literally). I have already used my Razor for glassing deer that are over a mile away and being able to identify small details on their antlers.
Optics are one thing in this world where I firmly believe you get what you pay for. That isn't saying the Diamondback wouldn't work for you, I'm just saying the Razor is likely way better but again, it depends on your intended use.