DVD Talk Forum - XBOX HD-pack question?

I just got an XBOX, along with the Monster HD-pack & fiberoptic audio. On the menu that comes up when you have the HD-pack plugged in, you can enable different resolutions. Should I turn them all on? My HDTV can handle all of the signals. Or should I just turn on one? No instructions with the HD-pack & no mention of it in the XBOX instructions. Should I just turn them all on & the game will select it's own resolution? Also, which games are 16x9- on my PS2 SSX Tricky & a few others had a 16x9 mode. I have Halo, Obi Wan, & Oddworld so far and none look 16x9 & I didn't see any options for it. The 5.1 sound is awesome though, better than the DTS on PS2!