im about to order a Feathertouch crayford focuser for my celestron c14. They are suppose to be the best for imaging.
They also make one for meade sct telescopes.
http://starlightinstruments.com/stor...&product_id=51
http://starlightinstruments.com/SCT-adaptersl/index.cfm
This is a rear cell focuser so you wont get any image shift when focusing.