looking for spindles or quills

Hi all,

I am making a drilling machine
and am looking for spindles to
use to hold the drills.

I will need to spin one at
about 12,000 rpm to drill a 3/64
in aluminm
and the other at about 4,000
to drill 5/16 in aluminum.

I am currently using a couple
HF cheap drill presses and am considdering
using a router with speed control.

if you have any suggestions,
toss them out !!

Dave