I think i586 is the right one. Is it on the easyurpmi page? Things like ia64 are 64bit architectures. There's also PPC for powerpc and SPARC. Generally speaking you'd have i386, i486, i586 etc. Your architecture is i686, so you can't go above that. In other words if your computer was an older version, you'd have to selct a different number like i386.
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