To Be Picture-Perfect, a Choice of 3 Digital, high-definition television can be a complex enough business in its own right. But the shift from analog to digital now also means a shift from fat to flat. &lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2"\ color="#666666"&gt;&lt;B&gt;-The Washington Post&lt;/B&gt;&lt;/FONT&gt;