A better question would be: "How much should I spend to impress others?"
I really get the impression that if you are asking the question, about top tier offerings, then you don't have any idea what the other offerings even have to offer. It's a lot like asking: "Hey guys, is Dura-Ace right for
me?" How should we know? If you, yourself don't even have a point of reference to appreciate the nth degree of refinement.
Recently somebody was so into the ultra-refined wowzers of scotch that they
paid over a million dollars at a fancy auction. It's a shame really, because to anyone it's shared with, it'll still just be really old scotch.
FWIW: I'm not a fan of SRAM. Your money would be better spent anywhere else.
You don't need to spend $5000 for a quality bike. In fact with all of modern manufacturing & the ever present rat-race, it's actually kind of hard to buy junk nowadays. If you don't
know a fancy uber wonder bike will make you faster or how much it'll do so, then it's supposed benefits will be wasted. (Hint: It won't make you any faster in any way that actually matters, & it will cost a lot.)
Check craigslist for all the 1 or 2 year-old mega ultra bikes at half price. I guarentee you'll find something there that'll make you just as happy.