I have no input on the tmc boards other than to say that of the stepper drivers you can by the tmc are the most expensive. I have a set of tmc2100 drivers for the black widow 24volt printer. they were over $10 a piece. For stepper drivers with your ramps board you should be looking at 1/32 micro stepping drv8825 drivers. They will give you the most amount of steps per mm of travel and cost under $2 each.