Toyota Avalon XLS or Limited?

I am in the market for a used Toyota Avalon XLS or Limited. Here's the thing. It is extremely rare to find a Limited in my price range that peeks at $15,000. There have been a few listed but they were gone in a flash. Now, I am not usually one that is picky about what car I drive, but for some reason I am being picky about this. For instance, the XLS does not have xenon headlights or rain sensing windshield wipers where the Limited does, and that's about the biggest difference but it's keeping me from buying an XLS. Any ideas on whether I should continue waiting for a Limited to show up, or just settle on an XLS?