I head up the Mac dept. here at the publishing company I work for so I had to go through all of this last week.
You can still buy some Macs from Apple that WILL boot from OS9, but Apple only makes higher end (dual 1.25 ghz and up) machines that are able to do it. If you can only afford their cheapest machine - single 1 Ghz G4, for $1500, it will ONLY boot OS X.
It's pretty obvious they are milking the market for the people that still need OS 9 machines, by only offering OS 9 machines for $1000! more. And there is no reason why they are making OS X-only machines other than they are forcing people onto OS X - even if the software market hasn't fully adapted yet (i.e. Quark!)
If you play a lot of games at home, do yourself a favor and get a PC. I realize that Apple has strong supporters ,mainly in the publishing/design community, but when you start getting outside that niche market the Macs start showing their weakness.