If you have a Costco membership, why not buy through them. Apparently you can get the best price that way. I bought mine from Classic in Round Rock before I knew about Car buying program at Costco. I wasn't too happy with Classic, cuz it seems like everyone's soo nice to you all they uptilll you sign the paperwork and pickup your car. After that they don't have time to talk to you anymore.
I love the guys at McDavid Acura, when I got my umm.. Acura. They always send you these coupons for service, like $69 for transmission drain and flush, or $20 for oil Change, and they wash your car whenever you visit them, and free cookies and drinks.