Hai. Just to start off, I am a complete and total n00b when it comes to mac mods. The most I've ever done is repaired my macbook pro's superdrive.

But I can tell you that pretty much any Intel chip will work with Tiger, it just has to be a cracked version, which is not hard to find. I have a Dell under my desk running OSX.
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MacBook Pro Intel Core Duo 2.0ghz, 1gb ram
Dell 228WPF 22" monitor
Mybook Premium 320gb
iPod Nano 4gb (red)
Wacom Intuos3 6x11