Personally I'd recommend scratching G5s off your list as well. Not so much for raw performance, which is still mostly adequate in a "Pentium 4's are still good enough too" sort of way, but because of the problems of software availability. Speed helps but the lack of updated plugins and whatnots (including operating system updates) is a problem with *any* PowerPC Macintosh. PPC Macs will undoubtedly linger in production for a few more years running old software that can't be updated but for a general purpose web browser don't waste your money.