OOPS! Need bigger stepper motors

Alan was gracious enough to suggest bigger stepper motors than 100
oz/in. I still need a source for something along the line of 300
oz/in, 12 or higher VDC (40 volts max). Anyone got any ideas? Alan
the URL to Hans' home page is: http://hans-w.com/. I have run the
system using small stepper motors and DANCAM and I am very happy with
the performance, especially considering the total cost has been around
$100.oo for everything needed to run 4 axis CNC. Except the motors
and machine mods, of course. Hans' boards use L297 and L298 chipsets
and the boards are capable of 4+ amps per motor and almost 45 VDC per
motor. Overall I am very happy with Hnas' boards and would suggest
them to anyone just getting involved in CNC. Just need a source of
useful motors. Anyone have any experience with running steppers at
voltages higher than their ratings?