SAN FRANCISCO (03/20/2000) - The price of 19-inch monitors creeps down--$20 here, $50 there. Four models on the chart under $400 means great prices for big-screen real estate. The C901 from Cornerstone Technology lands in Best Buy territory, courtesy of its rock-bottom price and clear text. Mitsubishi Corp.'s Diamond Plus 91 also finds a place thanks to crisp text. Models from CTX, HP, Iiyama, and Princeton fell short. Next month we review 21-inchers.