What servo to buy for this controller?

I have bought a used surplus servo controller called the Acroloop1000/12 (circa1990). I was able to hook it to my computer via the serial port
(RS232) and can send commands to this controller. Now I want to actually buy a servo and connect it to this controller to try out some robotics project. However there are so many servos out there and I have no clue which one to get. The link below is the manual of this acroloop1000/12
As you can se the connector P2 (Analog Drive Signal) shows the pins as follows ---------------------------------------------------------------------------- -------- pin1. Drive +/- 10Volt Analog pin2. Drive Analog Ground pin3. User11 (Relay# 117) N.C. pin4. User11 (Relay# 117) COMM. pin5. Watchdog relay N.O. pin6. Watchdog relay COMM. pin7. Key(n/c) pin8. USER11 (RELAY# 117)N.O. pin9. Watchdog N.C.
And also connector P1 (Encoder Signals) ------------------------------------------ pin1. Channel A(chA) pin2. Channel A not (chA not) pin3. Channel B (chB) pin4. Channel B not (chB not) pin5. Marker (M) pin6. Marker not (M not) pin7. +5v for encoder. pin8. Ground for encoder. pin9. Key (n/c)
Has anyone ever worked with this amplifier before? can you make any sense of it? What kind of servo can I purchase?
http://www.compumotor.com/manuals/Acroloop/ACR1K_INTERFACE_PARAMS.PDF
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I think you need a servo amplifier with analog speed input plus a servo motor, the cable that goes between the amplifier and the motor and the cable that goes between the motor encoder and the encoder input of the Acroloop. For some controllers, the encoder cable goes from the motor encoder to the amplifier and then another cable with the encoder signals goes from the amplifier to the controller.
It would be overkill for this application, but I am partial to the Yaskawa Sigma Mini ( you will need to fix the word wrap in the following link)
http://www.yaskawa.com/site/Products.nsf/products/Servo%20Amplifiers~SGDFSigmaMini.html
You can buy them through Minarik
http://www.minarikcorp.com /
Who carry a lot of other motion control equipment.

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Can the following amplifier be used instead ? http://www.a-m-c.com/download/be15a.pdf
I never thought how complex servo motor control is until I undertook this project.

actually
--
sense of

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Nobody uses servos unless it is the only way to accomplish the task... and the hardest way to do servos is to mix and match components from different manufacturers. On the other hand, if your objective is to learn about servos, this is a good opportunity.
That amplifier looks OK, but I would talk to the applications people at AMC first. Then I would draw out the whole circuit with every wire and connection and study it until I was sure every signal interfaced OK. Is the analog signal going to have ground reference problems? where is the velocity loop being closed? where is the position loop being closed? where does the DC power for my amplifier come from? does my encoder have the right number of lines? etc, etc.
After the electrical design is done and the hardware built, the fun of tuning the servo begins.
There is some more info here: http://www.msitec.com/engineering_resources_engineering_library.html http://www.galilmc.com/training/webconf.html

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