Second car: Thinking 2001,02,03 x5 3.0i

[Werewolf]

Hi all

I am currently looking for a 2nd car for my fiance. I am considering another 1st generation e53 3.0i. Looking for some advice on the following:

1) I have a 2001. Does the build quality improve noticeably in 2002 or 2003?
So far, I've replace a control arm, water pump and belt, crank angle sensor, brakes, sway bar end. Maybe $2000 in repairs, most done under warranty. Is this normal?

2) I am targeting paying 18-22K for the x5.

I am guess I am looking for advice whether to own one of these out of warranty or not.

Thanks!