I sold my PPC based MacBook Pro in 2007.
Costed in 2004 when I bought it EUR 4000
Regarding buggy: I said OS X 10.3 and asked myself (in paras, oh was it 10.4?)
Your point regarding 10.5 is pretty pointless as the only really good ones are 10.4 and 10.6
Good luck with those Linux tablets. Enjoy you OS-that-never-gets-updated, laggy UI, and malware/spyware galore.
For what I do with a tablet an eInk display is nice. Also your claim "real" linux as on the Kobos would be full with spyware is just nonsense: #ps axu -- shows all processes, and a little bit investigations reveals what kind of distro it is. There is a big hacking community around Kobos and Nooks