Maybe you want to use the cheapest, most readily available components, but I don't. I want high-quality, powerful components. I now they have their price, and I am prepared to pay it, just like most Omega owners.
The points in redesigning the graphics chip were compatability with the VIDC and to get graphics accelaration tailored to the needs of RISC OS's GUI, rather than Windows' GUI. But my point was actually more about the mainboard-chipset, specifically the northbridge (IOMD in the RiscPC). There simply is no high-end northbride designed for ARM desktop computers available from any of the big ARM manufacturers. What we want are things like FPAs, additional intelligent caches with instruction reordering to make optimal use of the slow ARM chips, acceleration functions for things the ARM is terribly slow with, like iDCD/DCD, the ability to use new CPUs without having to wait for a northbridge that could be shoe-horned into a desktop computer, etc.