Small shop does not mean cheaper, newbie can mean cheaper. Small shops are occupied by some of the best makers out there. There are also small shops that have just about anything you need technology wise. Big shops either mean cheap real estate, or big production aims. Normally.
Your list does yell custom aside from the odd thing they might not want to do. Tall yells custom to start with. My personal preference is not really for discs, and particularly not rear, discs, they weight a lot, get in the way, and don't really pull their weight. Front disc is another mater.
If you are price sensitive, you may want to look locally since shipping can be a big part of it. Naked, Coconicco, used to have reasonable frames + huge reps. There are some new names being bandied about on here, like Seiner. I would also look at Arvon, he does nice large bikes, though I found it hard to get a call back from them.