Software to find duplicate audio and image files

I am moving over to OSX on my iMac to manage my audio and image files. Right now I have them spread over several external hard drives on my PC. I have found a good program that does a very good job of identifying duplicates in both categories. They are called Audio Comparer and Video Comparer. Right now they only have windows versions. I am also looking at DupGuru Picture and Music editions which just happen to have a version for each platform. There is also Deep which I will try.

Does anyone have any good recommendations for Mac software that can perform these functions on several external hard drives? I do not plan to use iPhoto (Photoshop, Lightroom, and Lightzone) and obviously will be using iTunes but I desperately need to find and delete all the duplicate files before bringing into iTunes. I know iTunes can locate duplicate file, but names of them may be different since they have been in several Windows programs and formats (MP3, Flac, Apple Lossless....)

I could do this on the PC, but if I can avoid purchasing software that I will not use again (PC) versus doing it on the Mac and having the software for later use is my goal.

Any suggestions would be appreciated.