There's also the option of the less-pricey Zorro II busboards, I had a towered 1200 with one of those (forget which, exactly) and I stuck a Picasso II in it. The only problem with those is they're tougher to find, and you're still spending a good amount of money on the ZII video board.
The Indivision is actually decent at high res with low color modes, won't match 16.7 million of course but it might be the most realistic option.
