I have huge interest in OS4.x. But sinking nearly $3000 into it isn't an option, maybe if I won the local lotto ;-)
I will in future however look at buying a OS4.x setup and I've missed out some good bargains around the 300 GBP mark, I'd probably seriously look at swapping my A1200 goodies for a nice OS 4.X setup.
Although I do enjoy tinkering with the A1200 classic hardware.