I have to say that as much as I love my Amiga I have put way more into it then most people. I'd get the PC stuff myself as well. I have a nice P4 1.6GHZ now as well as this Amiga and I use them both about as much as the other. For What you have in the 1200 now the PC would be best to upgrade.
My A3000:
Mediator 3000
Cyberstorm MK III 060 with 128MB
voodoo 3000 graphics
SB 128 sound
10/100 Ethernet
I paid over $7000 for all this over the years!!!
but have been an A3000 owner since it came out.