Take a stroll through the laptop section at Best Buy recently? If you have, you know Toshiba's got a firm stronghold on the cheapie notebook market. The thing is, $400 systems don't exactly offer high margins -- a problem when people aren't buying that many PCs to begin with. And besides, who wants to be known for shoddy build quality and ho-hum designs? Not Toshiba, anyway. The suits in Tokyo were so fed up with the company's low-rent reputation that they decided to launch a premium line to prove Toshiba is indeed capable of making high