Take the advice and look through them first. Everyones eyes are different. To my eyes the Crossfire is one of the worst scopes I've ever looked through, as bad or worse than the old, cheap Tascos. Diamondback is good for the money, not a high end scope by any means, but I have a few on 22s and 22 mags, and my mom runs one on her 308. Better than most other scopes in their price range. My eyes don't like their Viper line, to my eyes the Diamondback glass is superior, but most other people think differently, so again look before you buy. I think the Razor has great glass, but my wife far preferred Zeiss when shopping for her.
I have heard some people have had issues with clocking and repeatability if you are planning to dial for windage and elevation at longer ranges, I'm not sure how often this is an issue or if it has been resolved in newer scopes, so do a little research if this would affect you.
Personally I'm a Leupold fan on scopes (I don't care for their binoculars) and while I have half a dozen scope brands on different guns, over half my guns are sporting Leupold. Next most common is Vortex Diamondback for lower end stuff. For long range I use the Leupold Mark IV, there are lots of options out there, including newer and fancier models from Leupold, but the Mark IV has fantastic glass for my eyes, I've never looked through anything I liked better, and they have been utterly reliable. Leupold supposedly has a great warranty and customer service, I can't attest to this as I've never had to use it on all the Leupold scopes I've owned. Vortex has a reputation for great warranty and customer service also, unlike most other brands I haven't had to send one of their scopes in to test it. Everyone I know who has had their Diamondback binoculars and uses and abuses them extensively though has sent them back at least once, and there has never been a quibble from Vortex and their service has been fast and painless.
