It is awfully quiet in here...
I found a FIMEC spindle from ekstromcarlson,
Model SM-C78 Spindle Motor, 4.7 HP at 18000 RPM, 220 Volts, 15.3 Amps $4500.00
Toolholders Not included
Reactor (Recommended between drive and motor) $227.70
Variable Speed Drive (5HP, 220V / 1Ph / 60 Hz Input) $835.05
This spindle is still longer than I want. I think it was 491 mm or so, with the ISO 30 toolholder.
I can spend more than this, I have but to find a shorter spindle...