You have done pretty damn good on this one mario, Like hughy said, getting a MPCC is critical for these newtonians.
www.tan14.com Peter tan sells them for just under 200 to your door which is a damn site better than you can get here. alot of people can vouch for hong kong pete hes a pleasure to deal with.
PHD for guiding isn't bad but i prefer Maximdl5 for guiding/capture as it really does a good job. its also the other features of it that make it a total all in one package (all they need to do now is sort out there rough image presentation and it would be the sole astroprog that i would have).
If you are really going to get into astrophotography, eventually youll look into Vingetting basically the cut off of the light cone. a quick easy fix/mod to do to the skywatchers is replacing the secondary mirror with a larger one, quite in expensive (mine was 49+p&h) but the increse 100% illumination of your ccd/dslr sensor is worth it.
Be sure to ask many more questions as there is alot of knowlege/experience in this forum!
Good luck and hope to see some more non beer affected subs!