Further to that... It might be worth having a look at the Swissonic MDR-2

SWISSONIC MDR-2 - U.K. International Cyberstore

...which seems to be a very cheap way of solving your problem (£80) although it only records at 44.1 khz (video normally records at 48khz) so you'll have to convert it to sync with your video, although most sound software will do this.

I haven't used or seen the Swissonic myself though, just going on what I've read in the audio press.