Electronic shifting and disc brakes won't affect how the bike rides, but they will complicate the build and limit the resale market for the bike.
So before you commit I'd suggest getting a bike with the geometry you're considering and spend some time on it. I say this not because I went through three CXish bikes before settling on a gravel road rocket that doubles as a CX race bike. NOT because i happen have a gorgeous Ti all-rounder for sale (Kish 57x57).
Yes the builder may already know the answer, like Hampco. But trying for a while, even if it's outside where you think you want to be, may learn you something.
Material choice, Ti vs steel, I see as more builder dependent. But Ti is the love-you-long-time material, able to shrug off scratches and dings and still shine like new after a rubdown with Nevr-Dull. That said, a close friend has a gorgeous steel frame that gets a new paint jibe every few years and looks like a new and different bike.
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