Usually, when an antique mall moves, it heralds bad news. But that's not the case with Thompson's Antique Center of Texas. The new place, in the former JC Penney's in Northwest Mall, is movin' on up, as the Jeffersons would say. The old venue was musty; now, it's cheerful, with better air-conditioning and lighting. They've attracted more dealers to fill the site's more than 100,000 square feet — good dealers, at that — while keeping the same friendly staff and volunteers. One recent swoop proved to be one-stop shopping for a dinner party à la 1950: We picked up nearly a complete set of darling Wedgwood china, festooned with delphiniums; some lovely, hand-embroidered pillowcases; a set of knives and forks with Bakelite handles; and a canasta tray with two decks of unused cards. Dinner is served, thankfully sans the requisite tomato aspic of yore.