congrats! I also have a rev. A single processor 1.8 G5, and even now, 2+ years after its introduction, it's a great, great computer. Got that 900mhz bus, the 8 RAM slots, etc. Should serve you very well. May I ask what you paid (just curious about the current value of my machine)?
edit: oh, and in reference to the site linked above - the OP said his was a rev. A, and the site specifically says, several times, that the problems were NOT present in that model, but only in rev. B (the 600 mhz bus and 4 RAM slot model)