Only so this won't get lost at the bottom of the long and tedious Rivendell thread already hanging around here:
For what it's worth, I was an adult cyclist for more than 30 years, enthusiastic in spurts but never really comfortable or at ease on my bikes (even though I averaged 3000-4000 miles a year in a place with a seven-month season). When I finally decided I could afford a midlife crisis, I bought an Atlantis frame and fork and built it up pretty much as Grant recommended. I was instantly (I mean instantly, first ride) more comfortable than I'd ever been, and within a few months set a PR for 50 miles at age 58 because I was able to stay on the bike longer.
I've since bought a used Rambouillet (an ex shop demo w/105 components), and it has all the advantages of the Atlantis in addition to being a little lighter and faster. All my dealings with the company have been absolutely unbeatable, they replaced a wheel I tacoed without an instant of hassle even though I admitted it was my fault, and Grant personally has answered several questions and responded to e-mails. If you think Rivendell or Grant are talking down to you, as somebody said, consider the possibility that maybe he's right. I know he was in my case.