Reinstall lion due to missing recovery partition?

Dear Apple Community,
Here is my situation: I have a 3-partioned drive inside my iMac. One has Lion installed, one has SL, and another is an empty partion. Unfortunatly, there is no recovery partition installed on my computer. While I am fully aware that you can boot from an internet connection and run Installation/Utility services remotely from Apple's servers, I'd like to install a local recovery partition for more convience and peace of mind, should anything go wrong in the future.
How can I reinstall Lion without losing my data? I currently keep up to date Time Machine backups on an external drive. Can I run the "Install Lion" app to easily recreate the Recovery Partition? Would I have to wait 6 hours while I Reinstall Lion, then do a Time Machine Recovery?
Just wondering if I could get some feedback on the best move here. I know there are a couple of options. Thanks for any help!

You can reinstall Lion right over the top of the current install and not lose any data on your computer.
But I'm not sure that will recreate the recovery partition. It should I'm but I'm not sure it it will.
Have you run Software Update? it has been my experience that if the recover HD is not present SU will see that and download the correct files to recreate it. Buit again this was on my MBP when I did a reinstall of 10.7.1.
If you choose to do the reinstall make sure you SAVE the downloaded files and create your own Lion Install USB Thumb drive for future use.
There are instructions all over the net to do this and I have been using a nice little program to create the USB drive. The program is called LionDiskMaker, it works very well for this.

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