adman...
you don't need stinking wads of cash to do what you need to do. You have a skywatcher focuser? use that as your guide scope, PHD is capable of sub pixel guiding that means you can set minimum pixel movement to .15 of a pixel.
I have done the same and with the f4.72 10" the finderguider is f4. its a simple matter of matching the thread to the back of the finder and removing the finderscope eyepiece. Ill take some images for you on this one and post them up sometime over the weekend.
I currently use the craford style of focuser but you have the blue tube so it looks as if you have the rack and pinion style, look at a moonlight focuser for just a bit over 200, it will serve you well. all up you can get away with the whole rig for just >$300... not thousands.
http://www.focuser.com/cgi-bin/dman....cgi&category=3
peter tan has MPCC's for 100 dollars less than anywhere in aus
www.tan14.com youll find it there. 170 i purchased mine for recently
another piece of advice unless you have money to spend, spend wisely untill you know for certain what you want to image, the setups change dramatically depending on your desired targets.! its taken me more than a year to make sure of what it is that i want to image, now its a case of uni student budget to make things start happening. see my threads on turning the sw 10" into a astrograph. slowly but surely itll happen.