Same here. I jumped to Apple in the early 2000s when I realised here was a very nice machine that let me run the rather splendid iLife suite, MS Office and let me tinker to my heart's content with a BSD Unix. Best of both worlds.

I live fairly happily with hardware tinkering restrictions in my iMacs, but the inability to upgrade RAM in the new smaller iMac may be the last straw. It's really irritating.