I think I'd get the 1.42 model but skip on the bluetooth, dvd writer and keyboard. After having the iBook I'd say 256MB was enough. The only time I've had thrashing discs was when I was trying to run Virtual PC on it.

Just read the T's and C's, in order to qualify the computer has to have been available for purchase on the 25th of Nov 2004. So it looks like the Mac mini might be excluded.