You are right, this is a great resource. I am not able to answer your question about the 'best' router to get, but I am wondering if you actually meant to post in this section?
I don't know how much you've looked around the forums but this area is only one VERY small section of the entire forum. This is the area for folks who are interested in or have purchased from XYZ Gantry.
You might want to look around the forum catagories on the main forum page.
You don't give a lot to go on either. I think you'll find that VERY broad and general questions may go unanswered. Folks on this forum are great but some questions are just to wide open to be answered.
I don't know if you want to build or buy? I am a newbie myself and chose an XYZ Gantry mechanicals kit as a way to accelerate my build.
Have you made any of these parts your after?
Have you thought about having a batch run by someone else at the start?
If this is the only reason you want the machine it may take some time to recoup costs. I am NOT trying to discourage you, just not sure how much thought you've given to this side of things.
You say you don't actually need an automatic tool changer. Any machine can be told to stop and wait for a manual tool change and then continue. It does save some time to generate your code to minimize those tool changes.
Sorry I can't be of more help, but didn't want your post to languish here. If you look around the forums you'll get an idea of what folks are doing with their machines and what it takes to build one.
I wish I could be of more help to you.
Good luck on your product and venture.