First Proper CNC Router

[JAZZCNC]

I think i need to check my PSU calcs. Can someone point me towards some example PSU design calcs?
Also, any idea if there is any benefit of AC vs DC?

There is absolutely no difference. I've built loads machines using both and see no performance or reliability differences between AC or DC.
The AC is simpler for obvious reasons so my suggestion is go with AC.

Also, 525Va transformer will do what you need. 625Va will give you a bit more overhead, which you won't need, but does increase inrush and that could give you issues with MCB trips. However easily solved with D rated MCB.