Ah, but how about
Slightly deeper A1200 sized case
Motorola Coldfire CPU (to retain 680X0 compat)
AGA chipset and a modern VGA chipset also
Scandoubler built in (as well as TV/Comp out)
Laptop DVD-Rom on LHS of case, Full 3.5 HD interface
No PCMCIA slot - replaced with mini PCI interface
Integrated PSU (like old ST had).
3.5 HD Floppy.
PC PS2 compatible Mouse Port
External PS2 KB socket (to override internal if connected or work with - could be fun for games)
Full compat with older gamez apps and decent enough CPU and graphics to do internet and more modern apps.
And lets make it £200.