I'm feeling too lazy to format my response to racerx with proper tags. However, I will respond to his major points.
1. 90% of computer users don't need their CPU power.
While I haven't done any studies (and I suspect you haven't either) I doubt this is true. It's a good guess that most people *usually* don't need a high end CPU but I know I wish mine was faster all the time. IE must have a terribly ineffecient rendering algorithm because it can take 40 seconds to render a big page. Even web surfing takes a strong CPU under OSX. RealPlayer consumes all the CPU or it will skip. iTunes can use 50% of my 500mhz g3 (iBook). And of course gaming can exaust your CPU resources.
What I'm getting at here is that even normal stuff requires a strong CPU.
Personally, I do also some atypical coding because I'm working on a comp sci master's degree (in addition to working as a programmer during the day). Whenever I write stuff for school I find myself wishing that my code ran faster. (Ok, let's not rip on my code here, these are processor intensive apps
)
2. I should consider Classic Apps.
Well, maybe you're right. However, I bought this machine because of OS X. I'm not a normal computer user in that I'm not just looking to complete a task, I also care a lot about how it gets done. I'm not happy with a cooperative multi-tasking system. I can't stand it. I can't stand that apps are CPU starved in classic as soon as I click on an OSX app. I can't stand that an app can overwrite memory that's not it's own. I can't stand OS9.
If all I cared about was having an easy to use system that got things done OS9 would be an OS to consider. However, it's not for me. I want a full featured OS that has pre-emptive multi-tasking, predictable and controllable CPU scheduling, a command line, and etc. I want a unix based OS.
Using OS9 would not make me happy and OS9 apps are not worthy of my money (according to me).
Vanguard