Need help recovering .dmg files from an accidentally reformatted external hard drive

Help?
I went to make a copy of an important drive and accidentally re-formatted it (re-formatted mac journaled, originally mac journaled).  The drive contained a bunch of important disk image files which I need to retrieve whole. I'm fairly confident that the files are still there and only the  table information got overwritten, as the re-format took about 30 seconds.  None of the  recovery software I've seen however, can retrieve .dmg files, or such large files (these are up to 32 gb each in size).
Any suggestions on how I can retrieve these disk image files?
-F

Here is a selection of some data recovery products, in case it includes one you have not yet researched:
http://www.prosofteng.com/products/data_rescue.php
http://www.macintosh-data-recovery.com/
http://subrosasoft.com/software/filesalvage

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