Existenz and Videodrome are my Other David Cronenberg favorites. I actually had to check the release date of the movie on Wikipedia and read about it few minitues into Videodrome. if it was leleased on 2003 it would have been way ahead of its time. But it was actually released in 1983.

I can say the the late 90s had some great movies that explored the nature of reality. The obvious best was The Matrix. Dark City was also really great. In fact the ending reminded me a little bit of what Matrix Revolutions ending looked like. Dark City was even better than ExistenZ IMO. The Thirteenth Floor was a really great one too. It wasn't as good as the other masterpieces but it was really good.

Truman show touches similar themes but without much of sci-fi
Enjoy yourself!