I have to thank Ja Phule, jlilies and Qooop for all their great information. I upgraded my Xbox last night finally with 100% success, as long as the tweaks I do in the future dont mess it up
Yesterday I bought an original of Mech Assault (used) for $5, Action Replay 8MB card and usb dock for $30 and the Intech HD AV pack for $20. I didn't need the HD pack (though I wanted to see if the HD AV pack would give me better output and I wanted optical digital output), so the upgrade essentially cost me $35.
The process could not have been easier thanks to Krazie's nDure installer. Anyone even considering a media player should highly consider an Xbox with XBMC and I am upset I didnt go this route sooner. XBMC is such a powerful app and unbelievably customizable...you need to visit http://manual.xboxmediacenter.de/wakka.php?wakka=Index
to see just what can be tweaked.
I started the upgrade process at 10 pm last night, had the softmod done at 11pm, and had installed XBMC by midnight. I was so amazed by the features, I was up until 6am tweaking and messing with XBMC!
FYI: I am using XBMC to play ISO rips along with MP3s for 95% of my collection. I also tried replaytv files, Divx files, and other compressed formats and it handled all of them beautifully. If anyone is messing with media players and are getting frustrated by the lack of features or are disappointed by the lack of recent players to the market, there is no reason to wait. XBMC r0xx0rs!