There are too many tunes out there for me to have a favourite. But, among the hornpipes I enjoy playing the most (in addition ot some of those malready mentioned) are:
The Humours of Tullycrine
Re: Sailor's Hornpipe at warp speed - No, I can't play it that fast and nor would I want to. It's impressive, right enough, to be able to co-ordinate your left and right hands at that speed but, to my ear, there's not a lot of music in that clip, just a lot of notes.