I have a spindle on my Shopbot, but I use a Porter Cable 7518 on my router table in the shop.
I recently purchased some new collets for it, from
http://www.precisebits.com
They make a precision replacement collet for the router, very similar in design to the ER25 spindle style. The prices are very reasonable, and the service was outstanding.
Just thought I'd pass it along..
AJC