This has been discussed in the past (use the search function), but they're all fine, really. Although I have the Monster cables, I don't think they're worth what they cost; my Pelican ones did just as good of a job.
FYI, if you can still find one, the S-Video cable for the Nintendo 64 will also work just fine. Because it's N64, it's usually much cheaper than the Gamecube equivalent. The cable itself, however, is identical.