No idea I found some that looked cool on Amazon for 55$ STEPPERONLINE 5PCS Nema 17 Stepper Motor Bipolar 2A 84oz.in 48mm 4-Lead for 3D Printer/CNC https://www.amazon.com/dp/B00QEYADRQ/ref=cm_sw_r_cp_apan_glt_i_3C55RWJBZFWH86FR4YZY?_encoding=UTF8&psc=1
I just completed my build and ran through my first cut job 2 days ago.
Since you have the experience of the first one, at least you are able to understand there 'could be' newer tech.
Steppers, I went with generics from amazon, but the real difference is with the stepper driver. The kit V1Eng for the SKR Pro with the TCM2209's is the way to go. I literally put this same setup in my Ender 3 Pro 3d Printer, and that works so nicely. but the real win is with the stepper drivers.. they are so quiet !! not that you may have that issue in general, being a cnc machine, but cutting out any noise in my life is a good thing.
Steppers are pretty much all the same. Technology around that doesn't matter for this application, using UART mode as required for the mpcnc.
Your powersupply is more than adequate to power the new unit. You can pick up a MeanWell for inexpensive as well. I overbuild, so I went with this one.
Good luck.. have fun building. !!
here are the ones I use on my d-bot:
https://www.amazon.com/gp/product/B00QEYADRQ/ref=oh_aui_detailpage_o02_s01?ie=UTF8&psc=1