As the broadcast network upfront marketplace draws to a close, one of the bigger surprises is the cutback in Ford Motor Co.'s budget. The auto giant spent $65 million to $70 million, according to network and agency insiders, down at least $15 million from a year earlier. Ford generally spends more than Chrysler Corp. in the upfront, but this year Chrysler checked in at the $80 million to $90 million range, the insiders said. Even Nissan Motor Corp. spent close to $100 million this year. As usual, General Motors Corp. was the biggest network upfront spender, at about $250 million.