Looks like there have been some suggestions already but I thought I'd make one. I've had the Dewalt DW618 for a little while now and really like it. Comes with a 1/4" and 1/2" collet, fixed base, soft start and 6 speeds, 8,000-24,000 if I remember correctly.
It's currently $150 on Amazon and there is an instant $20 rebate on it so that knocks it down to $130. And that goes until June 30th, 2017.
Edit - Corrected information and added link.
"Spindle" is probably the wrong tactic. Try "X router motor"
https://www.amazon.com/DEWALT-DW618-Electronic-Variable-Speed-Fixed-Base/dp/B00006JKXB/ref=sr_1_2
https://www.amazon.com/Bosch-1617EVS-2-1-Variable-Speed-Router/dp/B00004TKHV