It depends on if you have embedded cue sheets and/or single CD image files. I was in the same boat, using EAC/REACT to encode wavpack files under Windows, but not being able to decode under OS X. My previous solution was to run Foobar 2000 under Parallels to decode tracks to AAC format.
Luckily, I just ran across
X Lossless Decoder(xld). It's able to read my disc image files, pop up a message that there is an embedded cue sheet, and export to AAC for import into iTunes/iPod.
The only problem I'm having is that the album name is being set to the title of the last track in the cue sheet. I intend to look into the source and see where the problem occurs.
Xld works much better than play/max. Those can decode the wavpack file, but are not properly reading the APEv2 tags or cuesheet.
Hope this helps!