Time Machine Problem - New Internal Hard Drive, Now Backup Takes Hours

Need some help!
Background.
Almost 4 year old 24" aluminum iMac; 4 gb ram; 500 gb hard drive; OS 10.6.8.
About 2 months after Alpple Care expired, the internal hard drive failed (New Year's Eve of all times!). Everything else working great.
Had a Mac technician I know install a new 750 gb drive for me. I cloned back from SuperDuper, and was ready to go. The SuperDuper external is 1.5 TB, partitioned - one half TM, the other half SuperDuper.
All apps, internet, mail - fine.
I hooked up my existing Time Macinne (probably not a good idea), and the next backup failed.
Did some research, and since I have plenty of archived backup anyway, decided that the best thing to do would be to erase the TM external, and start fresh.
Did that, and as expected, first backup took a couple hours.
The Problem.
Now, every incremental backup takes 4 to 5 hours, even if no data has changed.
"Indexing" lasts for 45 minues; "Backing Up" reads 600,000 plus files, which also goes on for 30 or 40 minutes (approx.), and wants to Calculate changes etc forever; then the actual backup starts out at 10 kb, and in 20 minutes is at 30 kb and then after about an hour I start getting into gbs and the blue bar progresses pretty fast after that. Then "Finishing Up" takes approximately 2 - 3 hours.
Not right.  :~(
What I've Done to Toubleshoot.
First, I re-erased the TM external.
Then reset PRAM and did an SMC reset on the iMac.
Then backed up to TM again. The same problem persisted.
So next, I repeated that process (other than backing up), and I also deleted from the Root Library/Preferences com.apple.timemachine.plist, and from Home/Library/Preferences deleted com.apple.finder.plist. Then rebboted the iMac. Then I did a Disk Utility verify of the empty external - all was/is fine. Then I ran DiskWarrior on the iMac and all was fine; repaired permissions on the iMac from DiscWarrior as well. Then, I did another TM backup to the external, which took a couple hours since it was backing up to an empty drive.
Next 3 incremental backups still take 4 to 5 hours, even if nothing has changed on theiMac.
The Request.
Please if anyone can give me some easy to understand step by step options I might try to get TM working correctly again, it will be most appreciated.
If I've left out any details that might assist, please also let me know.
The problem computer is at home and I'm at work, so if any logs are needed, I can post those later today (but in that event, please tell me exactly which log to post and how to isolate it from System Profiler or Console (as there are many logs to choose from and I want to provide the proper info if someone needs to see a log to assist)).
Thanks in advance!

Pondini,
Did every step in D2 (green box) - except did not reinstall Combo Updater which I did late last night.
After that, did a TM backup - started at 6:15.
All apps were off.
Sequence of events and facts:
At start, 434.03 0f 500.1 GB available on the external TM
Last backup shown - 7:58 AM; Oldest Back Up - Yesterday at 9:56 (that's the 1st backup after I reinitialized the external for the 2nd or 3rd time trying to get this thing figured out)
Upon starting and doing the backup -
Preparing 250,000 (approx.) items (too quick to get the final number) - Parenthetically, this AM it was over 600,000; probably has to do with turning off Spotlight per your D2 instructions
Next message -
Backing Up 6.96 GB
Hung at 2 kb to 90 kb for 20 minutes before progressing
Ultimately, at 1.78 GB the  progress bar started moving rapidly (as it should) - so this isn't a cable connection issue - the Backup phase took 22 minutes, but from 1.78 GB to 6.96 GB took only a few seconds; I have seen this precise same sequence repeatedly the past 2 days
Next - Backing Up (the candy cane blue and white progress bar)  - Preparing 140,000 items - took 12 minutes
Now shows 426.95 GB available on the external
Next - Backing Up (no count of items shown) - started at 7:05 and went until 7:45 (40 minutes)
Next - Finishing Backup (blue/white candy cane progress bar; no count of items shown) - started at 7:45 - went until sometime after 8:15 (can't give a precise time because I need to sit down and eat :~)  )
Backup completed (between bites of chicken) at 8:23.
Over 2 hours - something isn't right.
Also, TM Prefs tells me that the Latest Backup was at 7:44 - odd.
Anyway - to take a step further, here's the TM Buddy widget info you might need:
Successful Backup: 02:06:32.
There is no log entry or data showing.
Just as I sent this, a new backup started, and it appears to be going through the same routine, from Preparing  ....
Gotta eat.
Please post any further instructions and I'll do what I can tonight.
Thanks!
What is the problem? How do I speed this mother up?
Thanks!

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