Georgia, I always use the original method and many use Jamiesons Whiskey, but I prefer Old Bushmills, perhaps because I toured that distillery and think it is the best Irish Whiskey available. The other very important thing is always rim your glass with white sugar to give that special final touch! Regular brewed coffee is fine as if it is too strong it overpowers the flavour of the liquor. Here is a little video which gives the ingredients with instuctions. Hope you enjoy your St. Patrick's Day dinner!

http://www.videojug.com/film/how-to-make-an-irish-coffee