Have you tried GrooveStats? They have a somewhat large (350+) selection of files, most if not all of which are directed towards pad play. Not all of them are OGG-patched, though, if that's what you meant.
If a song is:
-1:59 or under
-OGG audio
-sm file
-smaller than 5MB
Then it's ITG2 arcade compatible.
You should check out r21freak (registration required) - almost everything posted there is ready o be used on an ITG2 arcade machine (r21 or later with custom songs enabled).
Songs that are 2:00.00 or longer will need to use an ogg length patch (http://r21freak.com/utilities/OggLengthPatch.zip) to fool ITG2's length checking function to play them. (r23 will cut the round off after 2:15 of gametime)