I am buying Toyota Sienna XLE 2009 model, but confuse the diff. between XLE n XLE AWD?

Hi...I am planing to buy Toyota Sienna 2009, XLE. But little confuse with the difference between XLE n XLE AWD. XLE is 5000 less than XLE AWD. Can someone explain which should I go for. What do you guys thing about Toyota Highlander? Does Honda has similar van too. Which one you suggest. My budget is 30,000 only. Thank you.