Along with mostly what they've suggested (see above post), if you're getting a multi-region player, which is most likely what you should get, you probably also need to test the player with any of these:
- Any R3 DVD
- Any R1 DVD
- Any other region DVD, original or not original
- A DVD with RCE - like Gladiator (?)
- A dual-layered DVD - like Gladiator
This is to test if your DVD player can actually play ANYTHING and hindi siya mamimili. Because it would be so much of a hassle if you bought a DVD, say with RCE, which your player cannot read.