Should work out for your well. Many of Cisco's customers use the 6500 platform to do core type functions. I would only recommend, if carrying full internet prefixes, to ensure you go to atleast 512Mb of memory on the Sup and MSFC. No sense running into a memory allocation issue with your setup. I think you'll be pleased by the performance of these devices.
Are you planning to run CatOS or Native IOS? I am partial to Native but they both work very well.
Hope this is what you were looking for,
Don