I'm guessing you didn't follow the Unofficial Waiting For Arrandale threads, no one in here knows when new versions will be released, and even the good educated guesses proved to be wrong.
What if the next versions have problems to, will you wait again? Seems like the people with issues with the current batch are in the minority, mine's been flawless so far. With anything as electronically complicated as notebooks there are gonna be problems, if you're gonna wait until a perfect batch comes out then you'll be waiting forever. There's always a chance you could get a lemon so just go for it and get one now if you can afford it, the odds are far more likely that there will be nothing wrong.