I use my Logitec QuickCam Pro 4000 because that's what I have. It's about the same sensitivity as the ToUCam's of it's day (unsure on the new ones). It works well on bright stars (for my telescope, magnitude 5 or brighter stars).
I have recently been playing with a long exposure modified ToUCam. I haven't found it as good as I expected, requiring 5+ second exposures for stars I couldn't guide on using the QuickCam. So for me it's not looking worthwhile at this stage.
My preference would be a second hand Meade DSI I, but I never see them available for purchase and don't want to pay for a DSI II.
