Personally, I don't think any of the custom saws make fiscal sense. It's important that you learn to sharpen and set a saw, and on the small tooth saws, it's not critical that you do perfect work.
There are gobs of lovely old saws in the UK for 30-40 quid (backsaws), and very good manufactured saws (like LN and LV). The carpenter saws, if you're going to do rough work, or perhaps try to find a 24 inch 12 tooth saw, should be vintage. There's nothing to be had for reasonable new, and the process in making them is more of an industrial process.
A 200 to 400 pound custom saw makes about as much sense as does a $3,000 infill. They both work very well right away, but both are a waste of money if your point of focus is making things and not "having things". Fine sawing is never going to be an appreciable part of the time in a project, just like smooth planing is a small part of the time. And no infill will outperform a skilled user with a stanley plane, just as no new saw will outperform a skilled user who is using an older saw that they're familiar with. And certainly, no new user with several thousand pounds worth of smooth planes and dovetail saws will come close to matching a competent user with old saws and planes (which allow you to focus on getting the work done rather than protecting your tools from damage or rust).
There is merit, too, in the hardpoint crosscut saws that are about 15 quid. They will crosscut large stock faster than you can file an old saw to crosscut (they are a bit rough on the backside of a cut, though), and if you ever have a trouble job, you don't have to sacrifice a good saw doing it. I keep one of the short ones with large teeth, and one of the panel saws that's 26 inches long.