Best Buy employee Mohammed Bukhari, left, assists customer Salil Necholy with a computer purchase in the San Francisco store Friday, April 6, 2007. Best Buy, the nation's No. 1 electronics retailer, this week posted an 18 percent rise in fourth-quarter profits despite a bruising environment of flat-panel TV price drops. No. 2 Circuit City, on the other hand, swung to a loss in the quarter and is shaving its total work force by 8 percent, laying off 3,400 of its most experienced (and expensive) clerks. Analysts say Best Buy is executing well on all fronts. Its rapid expansion and earlier investments in its Geek Squad tech support service and high-end Magnolia home theater segment, all part of its "customer centricity" strategy, are paying off.