Clever exploit of Apple's OS transition

Apple will provide $10 upgrades to 10.5 if you've just bought a 10.4 machine. This can be translated into a clever exploit ....

Macs-imizing your Leopard upgrade:

... If the bottom line is the bottom line, the lowest retail price for Leopard is probably $109 at Amazon. However, for a few hundred dollars more, you can get a new Mac now and a copy of OS X in the mail later that you are ethically and legally bound to install on that purchased Mac. The question then becomes: which Mac?...

The Mini is a lovely machine. My mothers has run for over a year with essentially no maintenance. I check in on it every six months or so (she lives pretty far away).

I wonder if a Mini will run OS X 10.5 server? Then you could buy the mini, buy server, put server on the Mini and that $10 10.5 goes to ...