I think as a combo of likes and ones to really show DVD medium: (not necessarily in order of best)
1. Die Hard I (5 Star Collection)
2. The Fifth Element (Superbit)
3. Starship Troopers (Superbit)
4. The Lion King
5. Fight Club (2-disc)

Others:
6. A Bug's Life (2-disc Collector's)
7. LOTR: Fellowship of the Ring
8. Alien Quadrilogy (though haven't seen it all yet)
9. Daredevil (really amazing visual and sound)
10. Die Another Day (also really amazing visuals and sound)