Always OAR, even when I was watching them on a 20" TV.
Odds are you will own the DVD longer than you will own the TV you have now, or even your next TV.
When you get your first widescreen HD display you'll be kicking yourself if you bought the version that was modified for that screen.
4:3 is fine when that is the original format, and in the few cases where the movie was actually filmed on 4:3 film and then matted to it's theater presentation. Removing the matting & displaying the full 4:3 frame actually gives you MORE material, however it may not be what the director intended you to see. You may see microphones & such that were not intended to be part of the final shot.
The debate gets even more complicated when you deal with movies like T3 where NEITHER the 4:3 or widescreen presentation present the originally filmed frame.
I forget what that situation is called, but in that case I'll take the theatrical presentation.
Viper GTS