You've selected a wonderful watch. Wear it for a few months. The Speedmasters aren't going anywhere, you can buy one then.
I'm a reaosnably experience watch guy, but I went through a similar thing as you. I purchased a Seamaster 1948 and, after a month or two of barely wearing it, I was thinking about selling a it. The Omega-Forum-Intellegensia suggested I just wear it a few more weeks - Now I'd never part with it.
Wear the watch a few months. It's amazing. It is as close to a GADA watch as exists and is a real looker to boot.
My guess is a watch like that will become part of you, quickly. If you're dissatisifed, then grab a speedy. But you'll be a lot more certain.