Whatever the Wild said, but I would also narrow it down even more.
Tajima and Barudan and maybe SWF.
I do not remember when I ran faster than 700-750. Sometimes I would go to 800 with big fill areas, but that is about it.
Also, look who has the closest tech in your area. If there is a SWF guy, I would go with them, if there is Barudan guy, go with them. Same for Tajima.
I have Tajima and Toyota machines (Pretty much the same machine) and I love them. Barudan was also on a top of my list, But when I got my first one, Tajima gave me a better deal.
If you have room, look into 4 or a 6 head. if you want to go smaller, remember that 3 single head machines could possible do more than one 4 head machine. One has a thread break, the rest of them keep running, reloading the machine while the rest of them are running. You can not do that on a 4 head machine, one of them has a thread break, all 4 heads stop.
Good luck