The 1080p camera's are bs, they can only pull that using lossy compression codec which makes it useless for ap work were you want a lossless codec. The ms cinema and studio are the best to mod for planetary work and some people have got some nice results from them. Garry honis has done a nice guide and review here
http://ghonis2.ho8.com/lifecam/lifecam1.html . As for ccd the old toucam is about the best and you mod them with a sony 618 for around 50 euro which makes them a great plantary imager , add a sc2 mod or usblx long expouser and you have a nice cheap deep space imager or guide cam
I'am preying to see usb3 webcams hit soon, the flea 3 is a usb3 astro cam and the tech is out there, its just waiting on ms and logitech to build a webcam thats sells at a price to make it worth it now.