Hey,
I'll float this out there. What are you going for in your collection? WhiteWater is a fun game, but the "shoot up the middle twenty five times to rack up the bonus multiplier" part of it, combined with the nails-on-a-chalkboard wack of the ball against the glass off the Insanity Falls ramp, made mine come and go in about four months. The rest of the game is as good as everyone says it is, but what a glaring hole in the rules.
I don't have much time on STTNG at all, but if it's as deep of a game as people say it is, I'd be inclined toward that. Based upon your current collection, you seem to like deeper games (Shadow, LotR, TSPP, TZ). Just my two cents.
Luke