MacBook 2,1 EFI reinstall

Hello Mac users!
Perhaps foolishly, I have undertaken a few experiments on my Macbook. I installed rEFIt, a third-party EFI which allows for switching to different operating systems at startup (in my case Ubuntu). Unfortunately, I think I will be moving away from this dual-boot solution to allow for more space (and I'll put the penguin on some other comp. :)). My question is: what is the most up to date EFI version for my macbook (2,1, 2Ghz Intel Core 2 Duo, 1 Gb RAM), where do I get it, and would the installation over rEFIt be any different than a normal EFI update? Is there anything I should be aware of that may complicate my reinstallation of the proper EFI? I have time machine backups, but screwing something up (out of warranty) at the OS-Firmware interface level would kind of trump the power of time machine. In any case, I'm hoping all of you brilliant Mac users (:)) can help me out to chill my worrying bones.
Much thanks in advance, and I hope you all have a great day!
-Dylan

Getting rid of rEFIt is a fairly easy task to do. I've done if myself, I'm actually in the same position, though I'm keeping ubuntu around for a while but anyways. rEFIt is actually a piece of software that takes over the controls of the EFI chip, but once you remove rEFIt, the EFI chip controls go back to as they should be. Here's the instructions to removing rEFIt pulled straight from the website:
If you installed through the installer package, these instructions are for you.
While booted into Mac OS X, rename or remove the “efi” folder. For a 100% clean de-installation, also remove the folder “rEFItBlesser” inside “Library/StartupItems”.
As for the ubuntu partition there's at least 2 things that you can do. 1)Using the gpartition on the ubuntu livecd to remerge the partitions that were created when you installed ubuntu to make one partition and use it just for your media files or 2)back up all of your files (documents, movies, music, etc.) and then use the mac os x install discs to give your HDD one partition and then reinstall Mac OS X. But of course that is just my suggestion on getting rid of ubuntu & restoring all the space on ur harddrive to one partition.

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