In my opinion, you might be disappointed with a 1260.
Sure the proc is much faster than your current setup, however, depending upon what you are doing you will still bottleneck on the AGA graphics chipset, which is slow, slow.
The only amiga's that ever got around this limitation were big box amiga's. you can tower your A1200 and get a mediator and voodoo3, which will help some, although, I don't know exactly how fast that will be not having had one, but its got to be better...
I owned an a1200/060, and I was not happy with the upgrade. I would have taken a 1240, with a graphics card any day of the week over a 1260...both is preferrable...but given a choice, and that this is a hobby, i would be happiest with the graphics card.
of course, back when I was deciding, the only choice was zorro 2 expansions, and a rumoured system called ateo bus...which eventually became reality and then folded not much long after that.
but today, the mediator is quite a solid solution. still it connects to the a1200 bus, and will be limited by that interface.
