You forgot the one move that would make the tech world explode:
Google - 126.8B Market Cap
I know, you said Who Should Apple Buy?, but just imagine if Apple and Google merged.
I think I hear Steve Ballmer screaming right now...
I recently wrote about the same topic on my blog here: [url=http://innerexception.blogspot.com/2004/09/apple-needs-xmac-or-imac-g5-mini.html]http://innerexception.blogspot.com/2004/09/apple-needs-xmac-or-imac-g5-mini.html[/url]
But I disagree with your conclusions. The point of a low cost Mac is not to maintain profit margins, those will have to be sacrified somewhat, but to grow market share at the expense of profits. Growing share diffuses one of the main criticisms from PC partisans, and it's also a defensive strategy as Linux desktop share grows. If Apple can get their share above 5%, the positive feedback loop of share driving software development decision efforts will guarantee the continued existance of the Mac platform. Apple needs to maintain existing app develeopers and expand the pool. A large percentage of growth in the PC market is coming from the low-end, and though a $1299 iMac is close, sub-$1000 is the magic number. I am not saying Apple is doomed if they don't get into the low-end market with a more PC-like headless machine, but I don't see them achieveing significant share gains without it.
Who Apple Should Buy With Their $7 Billion
Why You Won't Be Seeing a "Headless" Mac