Webcams....and why don't they work...!

So now that I spend a lot of time on YouTube, I was thinking of getting a webcamera.
Well actually I got one - but I guess it was to cheap because there's this delay on the sound. It's like 3 or 4 seconds in the clip before the sound actually follows. Maybe it doesn't sound like a lot, but then you try it...

Now my problem is that I don't know what webcam to get. I mean, it's not like I have a lot of money on my hands (and with Christmas coming and all...), but still. It's got to work right. Sound and pictures that works together = video.

I could really use some help here.
What should I look for?
Or even better. Which do you use, and does it work?