I was tempted by the Iyonix, but the cost was too high. I was lucky enough to get a second hand kinetic from friends, and am looking forward to select 3. Each version of select make the original RO 4 (which + dhcp + unicode is equivalent to RO5) look less and less appealing. ROL and castle must work together, not doing so would be a disaster to all.
The only new RO computer I could see myself getting in the next couple of years would be a portable, preferably a really small one. Something like a psion in size with all expansion via USB.
However, I do not expect to spend anything on PC specific hardware in the forseeable future - (anything I need is easily rescued from skips).