ti's are better because they are a titanium driver in them, which makes better sound. gi is a graphite driver which is about the same but wont give you as good base.
yah dude, i thaught mine were broken and they said life time warrenty... and i have the GI's too, got them off ebay for like $20 Cad their totally sick i put the skull candy stickers in my window
the ti's are your best bet. I just picked up the ti's, and the right ear didn't work right out of the box. they are rad, but I was diappointed with their quality, cause I had the Sony v700's before these.