I reckon DSI is better than spc880. More sensitive and sharpest image. The problem is Meade, with its will to be incompatible with any one.
My intention is use it as guider. Normally I am using a Canon Rebel XT for DSO and I was using SPC880 for planetary image.
In Brazil you can find me at Cosmoforum or at Astronomia & Astrofotos comunity
http://astronomia-e-astrofotos.1069742.n5.nabble.com/