This is an odd question. If you mean "do you have to spend between $600 and $800 to buy good boots" and "within that range, should I just buy the most comfortable ones?", I'd say the answer to both is "no".
That's definitely a very realistic price range for some very nice boots, but "most comfortable" may mean very different things to different people. Try to find a bootfitter who can help explain (and demonstrate) which elements of fit are more important than "comfort" in the boot (I mean that "comfort" in a boot does not mean the same thing as comfort in a slipper, or in a dress shoe, or a basketball shoe, etc... On the other hand, if you know how ice skates fit, and can relate to that form of "comfort" (snugness, etc), then you might have a good sense of it already).
For the pricing, you can find good boots for more, and for less, than that range. And this year's $800 boot could be next year's $500 boot, so it really depends on a boot-by-boot (or is that "boot-by-foot") basis?
I'm new to all of this, too, so this is just my $.02 based on the knowledge I've gained by asking questions and reading here...