I think you've reached the point that I reached about 15 years ago: frustration with AGA that limits you using software like Image FX, Photogenics, 3D renderers, and even DTP software.
See back in the day, the one thing I wanted was an RTG for an A1200, but everyone gave us accelerator after accelerator. There were all manner of workarounds, including using a PC to ethernet the A1200's display, single slot zorro slots with CV64-3D's attached, ISA PC cards (Pixel64).
I went through all the options and settled for an Cyberstorm II 68060 A4000 with CV64 with CV64-3D scandoubler. $800. And later an Indivision.
Now here's the most important question: what are ya gonna do on it? Yes I get the amiga environment etc, but what you're after is a productivity machine, and you can get so, so much better hardware and software for far less with a PC. And then fire up Winuae, which will run all your RTG amiga stuff far better than any real amiga.
From someone who's been there and back, save your money and enjoy your wedge A1200 running software made for its native chips.
