I use a Canon 450D and it gets some pretty sweet images. It has a large chip which matches my telescope quite well (you need to do some calculations of arcseconds/pixel). Makes for easy one shot deep space images (I've taken up to 10minute exposures so far, and intend to try for longer in the next few weeks). Webcams, even with long exposure mods have small chips which are not very sensitive and low resolution so you struggle to do big prints to hang on the wall. Though the Canon is a CMOS sensor it has a newer technology in the way the RGB filters are laid up on it, so it is as sensitive as CCDs of old. Being un-cooled it does have some noise of it's own, but short of spending thousands on a cooled CCD it is very reasonable and the noise is even and removed with dark frames and bias frames.
Instead of the Toucam (I have one too), try the Meade DSI II Colour. They can be landed to your door brand new for under $300 from fleabay. They have an eyepiece adapter or that can be removed and screwed onto an SCT rear thread (I do this onto an f3.3 reducer on a Celestron Omni XLT 127 as a guide scope (with terrible comadue to the reducer, but it gives wide selection of bright guide stars)).
Check out the stunning images of planets, moon and deep space (mostly obtained with the Pro mono version),
http://www.meade.com/dsi_ii/
Mark.
