I was out last night doing some testing with a SW120 at f/4 (focal reducer attached). I'm currently using it as a guide-scope for a piggy-back mounted wide-angle lens. Guiding camera is a ZWO ASI120MM as mentioned above by Glen.
Attached are single-frame mono images of the Jewel Box (5 sec exposure) and Omega Centauri (10 sec) - purely for demonstration.
I also have some more 'serious' shots I took with the SW120 and an Orion G3 CCD, using NB (quite good!) and RGB filters (not so good...). Mixed results!
Skull nebula (NB):
http://www.astrobin.com/125368/
Helix nebula (NB):
http://www.astrobin.com/135036/D/
Orion nebula (NB):
http://www.astrobin.com/127280/B/
NGC6940 Open Cluster (RGB):
http://www.astrobin.com/125603/
M33 (low to horizon, RGB):
http://www.astrobin.com/126583/B/
Stars suffer from bloating in RGB, especially the blue channel. But with persistence you cab do okay with this setup, especially in Narrowband as mentioned above. Good luck if you try it!