I kind of/sort of agree with most of the statements here...but I will point out, that while AGA is too slow to be acceptable...that when you get the mediator installed with the graphics card, don't forget it will allow you a high res workbench, but you may discover the overall system is still slow.
It's still goes tick tick tick as it hits the hard drive and you watch the icons draw....and windows move around herky jerky, not like paper sliding under glass...which is what you expect of any modern pc.
It's true that a speed clocked 060, fastATA upgrade, faster hard drive, mediator/voodoo3 kind of/sort of gets you an amiga that thanks to some efficiencies in the os and assembler programming everywhere, is sort of acceptable usable on some taks.....its way expensive, and you may just sit there and go 'ITS STILL SLOW'
if you are willing to go with the 68k only route, then buy a cheapo PC and Amiga Forever, you will have the fastest amiga around.
It's not quite as satisfying as the Mediator 060 setup...but in many ways its better and less costly, and faster and more reliable.
I'm just going to get a pegasos, if I ever get off my duff and do it...(soon)