"Note that the files below are language-specific, where “EN” is English, “DE” is German, “JP” is Japanese, "FR" is French, and "ES" is Spanish. Files are also platform-specific, where “x86FRE” is intended for 32-bit platforms and “amd64FRE” is intended for 64-bit platforms."
You want the one with 64 in the title.
Note that those DVD images are for the Enterprise version. You normally would only want that for clustering or using a ton of RAM or more than 4 CPUs. So you probably want the standard edition.
As far as I know all desktop processors are 64-bit these days and will runboth 64-bit and 32-bit operating systems. The difference between operating architectures (x86/32-bit and amd64/64-bit) is how much memory it can handle, the 32-bit has a limit of 4GB whilst 64-bit can handle much more.