#1
http://www.youtube.com/watch?v=R9MMJqb84LE&feature=related
I'm having trouble figuring this song out, i think I've figured out that the bass note is a low C# if that helps. Thanks
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#2
I think it's Standard tuning, Half-Step Lowered, Drop D. (DROP Db/C# TUNING)

So, in a nutshell:

eb
Bb
Gb
Db
Ab
Db

You should be fine with the strings you have, but it any of your guitars have a Trem, you'll need to loosen bridge's spring tension until your intonation's corrected.
#3
Could be C# standard, considering the positioning he uses.
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