Hi mate,
of the types that are widely available I'd suggest something from the the J Marttiini / Rapala range as a good stainless blade (that's the kind I used in the video), or something from Victorinox (who make the Swiss army knives). If you don't mind spending a bit more, something like this by Sabatier would be a good choice, although as it doesn't have a sheath you'd want to keep this one in the kitchen:
Sabatier knives - traditional chefs knives from France
Hope this helps,
Gary
