I just bought a Blizzard PPC (+ lots of other Amiga-stuff) with 060, and WOW, everything runs sooo fast compared to the 040 I was used to.
It's quite expensive to upgrade your A1200D into a IMO "usable" setup, so I don't know if it's worth it, when the OS4/AmigaOne or MorphOS/Pegasos combo just around the corner.
But if you really feel that you need a fast Amiga machine now, try to find some cheap second hand stuff for your machine.
