buy it now if you need it now. (i'm an 12" iBook owner). its unrealistic to expect the new Intel based macs to be a lot cheaper, and essentially, all new apps written in new xCode can be run in both PowerPC based and Intel based macs.
also, Apple says it is going to support the PowerPC macs for a very long period of time and will release at least two of its future Mac OS X in PowerPC version.
if you want to have the perfect computer, you really need to wait forever. |