It's just use the same as for a cheap fast Windows system.
Generic stuff for Case, floppy, CDROM is probably ok. 3 button mouse not 2 is a must, USB not PS/2 is nicer.
If you want an integrated mobo, I'd go for an nForce with a Duron. Nvidia has drivers for it online - for RedHat 7.2, and Mandrake 8.1 / 8.2. Try to get 256MB RAM, and obviously a 7200rpm drive makes a noticable difference, but see how the money lasts...
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