I think the way forward for individuals depends on their finances. I can't afford an Iyonix yet, so I'm sticking with select (and buying the ROM - this will give me 3 select machines though, the 10 machine bit is very much in select's favour for me).
If the cost of an Iyonix were no problem, then I think the high spec machine, would have to win.
Whether to get select now and an Iyo in a year (say) depends, I think given current situation, on whether you would keep the RPC as a second machine or not.
I don't think the current situation w.r.to Iyonix owners who are subscribed to select is really fair. At the very least paint and draw should be available to them NOW.