Great start to a very nice image doug... Cant wait to see it with plenty more exposure!
Decepticon - with narrowband and a OSC CCD you simply have to separate the channels of the resulting image and use the one that is of the highest quality.... Ie. with a Ha filter, Red is the channel you would extract, as that is where all the data will be... the Green and Blue channels will be nothing but noise.
Is it worth selling your DSLR + DSI pro 2 for a QHY8? depends, do you use the 40D for anything but astronomy, if not, sell up and buy the QHY8.. they are insanely good cameras for the money, and very very hard to beat at that price range too... Dare I say impossible to beat...