Servo Drive

What would you guys recommend for a 180 volt servo drive?
This would be for small lathe spindle with 3/4 H.P. @ 3.8 amps.
Currently, it has a 400 line encoder on the spindle.
Just running, the spindle, with a Dart DC motor drive at the moment.
Using Yeager CNC-Pro and Gecko G320's for X & Z axis.
In the process of trying out Mach 3 turn, mainly for spindle control.
Been using CNC-Pro, for 5 years, kind of tricky to set up for a lathe
(no tool offsets).
Do you have to have a 1 pulse per rev. feedback to Mach 3 when you
have a servo for a spindle?
If so, would the index pulse from an encoder work ?
I want to be able to thread, and do indexing, for live tooling.
Did some tests under CNC-Pro with G320 hooked to spindle, cutting 10
TPI on Aluminum,worked good, until I got to the sixth pass,
and spindle ran out of torque.
Heard some of the guys say, that the Rutex drives don't hold very well.
What about using an analog drive?

I'll post back later with a bunch more questions.
Thank you all in advance,
-John