IS there any way to connect two additional displays to a MacBook Pro?

I allready have a 17” Monitor and i’m considering buying a 17” MacBook pro. However my wise friend pointed out that buying a 15” MacBook Pro lets me buy a 20” Apple Cinema Display for the price of one 17” MBP. However, that would make the 17” monitor pretty useless. Is there any way i could connect the 17” monitor, the 20” Apple Cinema Display and my Macbook Pro 15” all together as one big screen?