Considering that you'll want to use specialist filaments (nylon, poly types, etc) consider that you'll want to add an enclosure to your list of requirements. Very much you want the bed leveling feature. Look for mesh leveling in your selection. An all-metal hot end will be required for the higher temperatures.

Another feature that can be very useful is magnetic sheet print surfaces. This allows you to pop off a sheet once the part is printed, slide another in place and begin anew more quickly.