Unless you have an application that will benefit from the 64-bit architecture, it probably doesn't make sense to upgrade to those super-expensive chips yet.
A good application would make good use of the 64-bit memory addressing, such as Windows 2K3 Server using more than 4GB of RAM natively (rather than using the old Win2K extended memory tricks), and also applications that are compiled for 64-bit, like Microsoft SQL Server Enterprise 64-bit edition.
I don't think you'll see significant performance increase if your primary use will be gaming. You can get an Althon XP 2500+ for so cheap right now, it's definately a good deal.
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