I recently purchased the '04 RX330 in November, and I absolutely love it. I have not noticed all the ticks and troubles that others have experienced with their RX330. There are only two issues that I have noticed; the headlights are adjusted too low to the ground, and I do notice a slight "lag" when trying to accelerate as experienced by others on this forum. There is, however, nothing that I personally have experienced with my car that would make me tell others to necessarily wait to purchase the '05 model.
Of course it is your perrogative to wait until the '05 model comes out, and it's quite true that Lexus may resolve all the other "annoying" problems others have mentioned. It is, however, no guarantee that the new model will not have problems of its own. In other words, no car will ever be perfect. My suggestion is to test drive the RX330 a few more times to see if you love it enough to purchase it. If you don't love it, then wait. It is basically what quirks in the car you can accept/tolerate. I personally can live with some of the quirks of the RX330. Good luck! :D