Gecko Servo Drive Choice

This is a question for Mariss at Gecko, which may be of interest to
other folks on the list.

I would like to know if a G320 or G340 drive would be more
appropriate for the machine I'm working on. It's a Rong Fu RF-45.

I am going to use the servo motors Dan Mauch has started to supply,
they are ballbearing, DC Brush type motors that have an optical 200
CPR HP optical encoder (800 Counts in quadrature) The motor is a
24VDC brush type, approximate torque is 420 oz in.

One caviat, I may end up using a different motor for the Z axis if
the ones discribed are not suitable for that axis.

I plan to use EMC for the system control software, and I don't know
if I can take advantage of the micro-stepping feature of the G340's
or if it is an advantage to do so in any case.

I would appreciate your thoughts on the best way to go for this setup.
Terry May