Hey man...welcome!
Just to let you know, I got my Si last November for 16.5K with very little negotiation. Just tell them you know they aren't selling well...also, in negotiating...I found it helpful at the end if you tell them that you are a member of this site and you will tell everyone where you bought your car from...also, tell them you will give them all 5's on their survey. But if they don't wnat to give you the deal you want...walk away. There are plenty of dealers with left over 03's on the lot. They may say "Clearance 17,333" but it's B.S...I got my car for well under that...no problem! Good Luck man!