Personally, I like the flexibility of being able to run OS4, Linux, and MacOS natively!
Yes, me to. I don't have much interest in MacOS- though being able to test web pages under Safari would be a plus.
Allen posted some points on using AmigaOne's as servers, basically again the point that if you run a server farm, using AmigaOnes is going to save you money in the long run.
see:
AmigaOneXEs shippingZoltan