Hi CNCZONE!

New here: Planing on building an xyz table from steppers.
Currently I just got the steppers running at 600microsec per quarter full step.
Steppers are 2.5Volts 4.5Amps. Vid:
[nomedia="http://www.youtube.com/watch?v=8PDGBBZNBoQ&feature=youtube_gdata"]YouTube - stepper_obsrv_1[/nomedia]
Question: how fast are fast similar rated stepper motors are? I needed this data for benchmarking purposes.
Do advice.
Thanks.