Supposedly, all of the 4,000 metre peaks of the Alps offer a view of Monte Viso; certainly the Zermatt Breithorn does (or at least it does if the obvious pointed mountain in the centre of this photo is Monte Viso!). Having seen the mountain up close I believe it is but if anyone knows better please let me know via email. As a quick viewpoint the Breithorn ranks highly, being less than an hour from the top of the cablecar, but via this route it's not exactly a marvellous challenge.