I think the Takahashi B-SGR works with the FSQ-85ED too but it's quite pricey. I'm going for an option that unfortunately isn't available outside of Japan but is quite a nifty little unit.
K-Astec in Japan has been occasionally making a few motorized focuser units for the Takahashi's. They're pre-order and make limited quantities. I hope to get mine late May/early June.
http://k-astec.cocolog-nifty.com/mai...85ed-2e76.html
These run for approx approx AUD$760.