If you want a BSD system, run {Free,Net,Open,Dragonfly}BSD. You can do it on cheaper and better hardware than Apple offers. It just might not look as stylish, but who cares? T-series Thinkpads have better keyboards than Macbooks, and you can still get a used T60 for less than a hundred bucks. (More recent models will cost more, but you'd be shocked at what you can do with a T60 once you get a new battery, max out the RAM, and replace the HDD with a SSD.)