(the wrong co, but)....
If your computer is running slowly, you would be amazed at the improvements you can often get by doing a full reformat/reinstall. You have said everything is backed up, so I would recommend trying this first, before going to a new comp. If nothing else, it might get you enough life in your current baby to last till windoze 7 comes out, and the initial bugs are solved..
But if it was me, I would be waiting for Snow Leopard... Mmmm... new shiney toys!!!
Stu the crazy bass from down under
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Polar bears for Obama!!