Ok, I need some help. I ordered the DSW Pro 500 on Amazon and just got it tonight and realized they sent me the 550wi instead. I have read a lot of reviews about how great the 500 is, but the reviews aren't as great for the 550wi. I plan on having this wired, so the wireless is not too important to me. My concern is, is there a difference between these two other than the wireless? I noticed that the 500 is more expensive on Polk's site. I want to make sure that I am getting the product I paid for and if the 550wi is not as good, then I need to return it asap. Please help!