>> There's no ARM machine that can compete with a QuadG5
>> machine in price/performance right now.

> That'll change next year. The year after, the opposite will be true.

Don't be so sure about that. While it's true that ARM performance will increase over time and actually make a jump next year with the advent of Cortex-A15 based chips, leading also to an improvement in price-performance ratio, used quad-G5 Macs are becoming even cheaper, improving their price-performance ratio as well, all the time. Currently, the average price that a (fully functional) quad-G5 Mac is sold for on eBay Germany is about 530 EUR, whereas 16 months ago it was still 910 EUR, which is a reduction by 42%. If that trend continues (and I guess it does) new machines with future ARM chips will definitely have a rough ride beating used quad-G5 Macs in terms of price-performance ratio for some time to come.