I'm with Gary for a low cost option. For imaging with a DSLR through the ED80 I used a 60mm f7 refractor with lowly ToUcam and K3CCD Tools. It rarely failed me. I have also used DSI (does a good job once your used to the envisage sofware), SAC 4.2 (works ok), LPI (

yuck), DMK21 (only tried it a couple of times so cant really comment, but I understand that the iceman uses it all the time with PhD) and ATiK 16IC does a great job when I can't find a star bright enough for the ToUcam.
But mostly I use either the ToUcam if I have ac power to burn and use the laptop or I use my TV Guider. It rocks!!