Hi Tony,
While this doesn't answer all your questions I hope it is helpful. I had received advice (from Optec) sometime ago that using a corrector/reducer combo in the ACF was not ideal.
You could consider the Optec F7 reducer (see link below). These are designed to work with refractors and do work very well with the Meade ACF (I use one on my 12inch LX200R). They are available at Sirius Optics (yes I declare I work there) for $369. If using with a camera/ccd you will also need a mounting plate to suit and these are around $85.
http://www.optecinc.com/astronomy/nextgen.htm
Peterm.