I remember being in a similiar situation a number of years ago. I could not decide between an F2 Speedster and a Silberpfeil, so I bought them both. I am glad that I did. The boards were very different. The Silberpfeil was very turny and easy to learn on and great for crowded slopes, the Speedster is fantastic for letting 'er rip at high speeds.
That said, if there would have been a Prior Metal board back then I would have gone that route. That board is very forgiving, yet rips in all conditions. Think Indy car grip with a Cadillac ride. I have not ridden the other two you mention, but I am saving up for a Prior myself.
Best of Luck,
sj