Hard Drive nearly full, but can't see why.

Hi there,
I've got a 2009 iMac (4Gb RAM, 500Gb HDD) running 10.8.5. I got a Finder warning about the Hard drive space this morning saying I only had 400Mb left. Which is very strange, because most working files are kept on my machine, but copied back to a file server, and trashed from my mac.
After some trashing of bits and bobs, I managed to get to about 60Gb free (so at least the mac could function properly whilst i was doing some investigative work.
I did a "get info" on each of the folders in my user account (including the hidden 'Library' folder). Counted up to about 85Gb. I then did the same for the system folder - Apps, System, and Library - which came to 34Gb. That's a total of 119Gb (which is about what I would have guessed).
So there's about 320Gb of hard drive space that's being eaten up, but I can't see where. I have been doing some heavy work in iBooks Author, so I opened up the iBA files and deleted the previous versions. Won back a bit of space, but not a dent really. I think the local snapshot versions are actually pretty small.
Thinking that it had to be an issue with some bloated hidden file, I used Terminal to show hidden files, and tried to use the 'Find' facility to search for files over 1Gb; there were a few, but none hidden, and none i didn't already know about.
I don have TIme Machine, but that's set up for an external HDD, so that's not the issue.
Any ideas what I can try next?

Hi Eric – Thanks for the reply. Forgot to mention that I checked out the storage in 'About this mac'. Here's the shot.
As you can see, backups are pretty much at zero, so assuming that the 'backups' section comprises previous 'versions' of files, (local snapshots), then theoretically these are ruled out too.
I've downloaded OmniDiskSweeper (thanks for the link), and ran it, which is where things get really wonky. I left it for ages. I presume it had finished scanning, as it gives no progression bar or 'finished' dialogue box. Check out the screenshot.
Check out OmniDiskSweeper's data. The 'User' folder is the largest (unsurprisingly) at 75Gb, but that is only what I thought it would be. Check out the total amount scanned (at the top of the window). 102Gb. 102. Yet, there's there 'Get info' box on the left, saying I've got 418 Gb used on the hard drive.
The system thinks that there's more data on the HDD than OmniDiskSweeper. I'm suspecting that there's a corruption somewhere. I tried a 'light' clean of my system cache (using MountainLionCacheCleaner), and did a safe boot to clear some caches, but no result.
Next, I'm going to create a new User to see if the issue is within the User account or system-specific. Then I'm going to start up CarbonCopyCloner to see what that reports. Back in touch soon.

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