Go for Page's guitar if you're a fan. Nothing cooler than owning something that one of your favorites played for many hours. I still get weirded out every time I take my Washburn I bought from Jon Donais out of the case... that thing still has all his finger grime on the board, sweat that has soaked into the oil finish, and the back of the neck is super fast from being used extensively. Doesn't feel like 'my' guitar, even though I own it now.
Is the guitar you're talking about his pink Horizon? Or something else? I had one of Chris Traynor's LTD MH guitars that had the Helmet logo'd case, which I paid about market value for ($400). Depending on which guitar you speak of, it's hard to give a dollar amount... but at the same time, if it's worth it to you, sometimes you can't put a value on it. If you have the money and the want, do it and don't look back.