Vista's protection doesn't apply to DVD's anyway.  It's mainly for Blu-Ray and HD-DVD, and right now it pays to stay as far away from those two .  Not to mention that they are expensive as hell at the moment - $1,000 for the drive or player, $30 for discs... uh I think I'll just stick with DVD's for now.  (DVD's are for all intents and purposes DRM-free, as CSS is trivial to bypass, legal considerations notwithstanding.  Blu-Ray and HD-DVD are considerably more draconian).

The main reason to be staying away from Vista is the BS factor - specifically one should not be supporting any of this crap.  If the folks at Microsoft had any sense they would realize that this has the potential to be a complete disaster - for them.  (In fact I'm sure that there are a good number that do, but apparently they are being ignored).