Hi recon

That log is quite useful, but the indications don't look good.I'm no expert, but have been told that bus errors usually mean hardware problems, especially bad RAM

Did your machine come with the Apple Hardware Test CD? Although it doesn't catch everything, there is a RAM test you can run from it.

I'm not sure where else you can go to get your RAM checked. If you find a good RAM checker, (or links) let us know.