A1200
68020 -> 68040/68060
2mb chip -> 32/64mb chip
DD Drive -> DVD
IDE -> SATA
Serial, pralell, mouse, joystick -> USB
AGA -> AAA? I don't know. 1280x1024 32 bit would be nice...
PCMCIA -> *insert new and exciting I/O port here*
A4000
Zorro -> PCI-E + PCI (ok ok ok, keep one or two zorro slots then!)
AGA -> No onboard graphics (well, keep the AGA then)
IDE -> SATA + SCSI
Serial, pralell, mouse, joystick -> USB