You don't need to worry a lot about matching the voltages and amps precisely.
i.e. you can run a 90V motor on 80V and vice verse. The drive limits the current, so you can use a motor that is rated higher than your drive.
For servo motors, you can pretty much ignore the 'continuous' rating unless you are running a conveyor or some similar truly continuous duty mechanism. For a typical CNC machine tool, I suggest using only the peak numbers for your calculations.
Note this applies to servo motors only. Steppers are altogether different animals.
I am using both Keling and HomeshopCNC servo motors. The NEMA23 motors peak at 20 and are a good match for the Gecko. The Homeshop versions seem to be better quality, but that's based only on a single motor from them, so take with a grain.