When deciding to purchase the Mac Mini I wondered if I should get the faster version (1.42Ghz) for the boost in processing power. I've read that the slower model (1.25Ghz) has a faster spinning HD. 5400 rpm on the slower model vs. 4200 rpm on the faster model.
If you're thinking about purchasing one - my suggestion to you is to still go with the 1.42Ghz model. The reason? Simple - the HD size. The 1.25Ghz model comes with a 40GB drive. The 1.42Ghz model comes with an 80GB drive. The real difference comes when you start up your machine for the first time and notice that the OS and the installed Applications take up over 15GB of space!!
I would have been very disappointed to get home and find out that I only had 25GB left on the 1.25Ghz model.
Food for thought - if you're thinking about purchasing.