Hi David. Once you learn the process you won't regret it and will wonder what all the drama over drift aligning is all about. From a Raw start I can be aligned within 20min max (assuming no questions on how to do it from other astronomers
) to within 1 arcsec/min drift in both Altitude and Azimuth.
Ok your questions.
1 & 3. Any video for windows camera (vfw), WDM cameras, and Meade DSI (there are others but I wouldn't recommend them for drift aligning really. Better off with a webcam). I still use and prefer to use the toUcam 840 or 900. There is just no drama with them. Plus its easy to get 1.25" adapters for them. Also The Imaging Source Cameras do a fine job as well, though the exposure settings can cause a bit of mucking around at times. The other camera you may want to try as its basically a toUcam 840 is the Celestron Nextstar though I've not used one.
2. Telescopes-Astronomy (Matthew Lovell) in SA sells the ToUcams (not sure where else). Bintel and Steve Massey at Myastroshop sell The Imaging Source gear. I'm sure there are others.
4.Curse the Demon Gods of Astronomy for their callus pranks and delights. Run and don't stop running. Yes it will work but you'll probably wish you'd never heard of LPI by the time you are finished. I'm sure jjjnettie will pipe up with her experiences here.
5. No experience with this camera but if you can load it via the WDM selection it should work. I know the QHY5 won't work unfortunately and the OSSA is much the same thing. Only my guess though. It would be great if it did cos then you'd have a drift camera, a planetary camera and an autoguider.
good luck on the journey