Jazz thanks,
i read a lot of posts on this forum. I saw that people really usually use only nema23 for hobby devices. So at the end i finished with three options. One that i already mention with nema23 motors (psu changed to 60v 600w). Price for that is around 450 $. Better nema23 kit is with nema23 motors with 2.5 mH inductance. That kit costs me around 500 $. The problem is that 500 $ is lot of money. I found also kit with nema23 3,8 mH and power supply 36V. I know what you and all guys said already, but difference between 250 $ for that kit and 500 $ for the best kit is huge. Is also difference in real world so huge? I did calculations with the cheapest kit, and with the most expensive kit. Both kit are fine with calculations. What should i buy? :(