Have you considered the Duet electronics and firmware? Like the X5 it uses a 32 bit processor, but it also has an Ethernet port and runs a web server. The firmware is under active development, by RepRapPro, myself, and at least one other person. The stepper drivers are A4982, ok to at least 1A as mounted and more with additional cooling. There is an add on board available if you want to drive more than 4 stepper motors or additional hot ends.
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