Linux is very appealing, because of its lower cost and apparent stability.
But I've checked it out, and I really wouldn't want to deal with compiling Ardour and the JACK stuff.
I am a network/hardware guy, not a programmer.
Hopefully someday the need to compile will change, as it has with some of the distros themselves, like Red Hat.
I've heard that kernel 2.6 has audio and multimedia in general more integrated. I think it was in this month's Linux Journal.