Well, I've said it before so wtf I'll say it again.
Never really saw the need for a mid/headless Mac. But now is really different - multicore beasts are fine for high end.
The processor speeds are now at a point when many of us are looking for a media server solution that's bloody well expandable !
Sheesh, the latest iMacs are a gimme - but no expansion. Yes fw, but no expansion beyond that. Apple give us a couple of slots for express cards, pls. Sheesh, even one would ...