I'd love to attend some Olympics events sometime. In 2010, they'll be held in Vancouver B.C., which is about as close as they'll ever get to Portland, I suspect. I may try to attend an event or two. Really, though, I'm stoked because a friend and I are going to try to attend World Cup South Africa in 2010. Now that is going to be expensive. But I've already begun to save for it. It's a once-in-a-lifetime trip, that's for sure...
We went to the semifinals and medals games of women's soccer in 1996. Very cool. That's an example of another sporting event that transcends sports. Again, it cost a good bit less than the NBA tickets referenced above, and we witnessed Olympic medals being won -- to me, that's fundamentally different from an early round NBA playoff game.
Note that none of this is intended to run down your desire to go... It's just that I'd want an expenditure of that sort to be really meaningful, and I want it to be something that would be much more than just watching a game -- after all, I can get a much better view sitting on my couch at home. If a playoff game after a long dry spell is a huge deal for you, then you should consider it.