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Tmc2100 is cheapest of the tmc drivers and would be fine. The 2130 is better but all the eBay ones need a bit of a solder mod - and is more expensive. I've used both - great voltage control to get the most out of your motor.
Teensy is good as has stable oscillator. But some arduinos do also - I think. A few people use ramps etc. Read the onstep wiki. And definitely go through the spreadsheet - helps with determining gears/motors for what accuracy and max goto speed.
I pushed the supply voltage on mine from 12v to 24v. Helped get extra torque.
I bread boarded mine to get it all going. It's a simple circuit though
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