Hello. I'm considering buying a floor model of Sony KDL-40Z4100 from BestBuy. The dilemma is I could buy a brand-new KDL-40VL160 from Costco for about $200 more. If I bought 4-yr warranty from BB (and I definitely will, considering it is a used unit), they'll cost almost the same. What do you experts think? And how do I find out how long the floor model has been used? (how do you access the service menu?) Thanks so much!