What is the best way to recover a corrupted file from a failing Hard Drive?

I have a 3TB WD internal drive that is starting to fail with Bad blocks. I noticed it when I had some write errors and so got a new disc as fast as possible to get the data off before it dies completely.
However, some files are failing to be copied with the Finder.  What tools are best for trying to recover these mainly video files?  I have Tech Tool Pro but its utility seems aimed at finding accidently deleted files.  I seem to remember a utility from way back that would repeatedly try to read a back block and re constitute the file. 
All suggestions are welcome!
Thanks.

Choose and use only a single background process to monitor health of a drive, they really are not safe to use multiple tools. And SoftRAID does its scan and checking in background during idle time for weak sectors - they are not really black/white but more xx tries to read/write.
as I mentioned, and you fit the profile, DW is one trick pony and can be used when you need to mount or access files to recover and backup.
Yes, DW will create a new directory. It has an advanced deep scan to scavenge for files.
Sometimes you just need to use DW's Preview to see what the drive volume 'looks like" now and what it would be after a rebuild/create directory. but sometimes you just want Data Rescue 3. both are in the $95 range.
Too often large backups, like 10 drives, are not well categorized or 'where is what."
Clone of a drive means you can restore the volume... TM to keep versions. But I don't have the 200% faith in TM sets or backup.
Sometimes a RAID6 is the ideal method for a large viideo catalogue or collection. And some people or businesses keep duplicate RAID6 sets, to mirror each other.
I liken 3TB drive sometimes as putting too many or all the eggs in one basket.
also, to keep any drive to 40% free which may sound wasteful, unless you consider the data' value.
SoftRAID 4 could be useful to zero and test the drive. Or to to 'take over' the drive even. Then to build a mirror from it.  MPG recommends using it even in non-array use for some of those very reasons.
choice now going forward: clone with Superduper / CCC / recovery with DR3 / and build the directory (or not) with DW 4.x.
With externals sometimes the weak link is the case and interface or drive enclosure, plus the bridge if any (SATA native and none is my preference). And controllers, which may be needed.
Instead of having to order a drive? always have spares and extras. Always have a clone and an extra that can be used to put into service. And order more.

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