I have no experience with Vortex products, but I've seen them around. Internet research is great, but there's no substitute for hands-on side by side comparison at a place like Pelee Wings. Other considerations:
Leave room in your budget for a tripod and head. You want something sturdy, light, and tall enough that you don't need to bend down even if the scope is downhill from you. My Manfrotto has been going strong for over 20 years, but I'm also very impressed with the Induro tripod I use for photography. A video or "fluid" head is a must for smooth panning. I have a large Manfrotto, but I think they make a smaller, lighter version now.
You get a lot more "bang" for buck from good binoculars than a good scope. Some people opt for good bins and a cheap scope for a variety of reasons. You will often not see the full potential of your optics because of atmospheric conditions and wind. (The classic case is looking across mudflats on a sunny day.) Deciding how good is good enough is a personal choice.
Also, sturdiness: they tend to get banged around a lot. Waterproofness: rain happens. Controls: can you focus with mitts on?
BB