I have a blue phat ds that has a scratched screen, and one hinge with the L and R buttons not working. Despite that, it works extremely well.

Oh, and I also have a ds lite that I got somewhat recently.

I just bought a white lite because I wanted better lighting.

I won't use it online because then I'd have to get new FCs.

Actually, if you still have the Phat-DS with the FCs attached to it, you can do a transfer.  I can't remember exactly how it's done, but I think what you need to do is boot up a game that has a Wifi Connection Settings menu, and it should have instructions on how to transfer between them.  (I think you have to set the recepient-DS(the lite in this case) to "Download" mode, but I'm not sure.)  That's if you really want to anyway...of course, that'll 'transfer' every game over to the lite, so that every Wifi-enabled game you set up on the original must be played on the lite now, and any sort of wifi profile you had on the lite will be erased(IF you did).