Hi ving
I would recommend GEM B/W camera for about $370 from http://www.allthings.com.au/Catalogue/CCS/gem%20monochrome%20low%20light%20cc tv%20dsp%20video%20camera.html
Attached are images of Alfa Centauri and Canopus, taken with 135mm Telephoto lens, 100 exposures. No tracking, I use AstroVideo software that stacks the images on fly, as long the selected star remain in view. Please note that original image in FIT format show more detail, but they are big, 1.6 Mbyte.
[IMG]file:///A:/2006-04-26-224-sum-001.jpg[/IMG]
Karl