Speaking of Spiderman….”Spider-Man 3″ will be the most expensive movie ever made when it opens May 4. While industry insiders claim Sony Pictures spent $350 million on production alone, Hollywood reporter Kim Masters reports in Radar magazine that the total bill – including prints and marketing costs – is more than $500 million, making the Tobey Maguire and Kirsten Dunst flick a record-breaker. One of the film’s producers, Laura Ziskin, disputed the $350 million number, and said, “I refuse to say the [real] number because it makes me choke. ‘Spider-Man 3′ was a super-expensive movie – the most expensive film we’ve ever made. But there’s no way you can get to $300 million.” A Sony rep claimed it only cost $270 million. The production spent more than $1 million a day shooting on location in union-heavy New York, and it also employed expensive computer-generated special effects.