Royal Flush/Card Whiz is an awesome game, I'd have to put it at the top of my list. Recently saw a Jet Spin for the first time, I'm intrigued by what I saw, looking forward to playing it more. I had a Jungle Queen, but it just didn't have the lastability that RF does.
Of course the EM versions of Sinbad and Joker Poker are right up there as well.