I'm looking for suggestions. I have a working amiga 500 with an adram540 and a dataflyer 500 it has the 3.1 rom installed. I also have a a2000 with a bad motherboard (fried had my computer apart when i was tired.)

I bought another on ebay but asis and had battery leakage. my brother looked at both boards didn't think he could fix them.
Anyway my dilemma ...
I purchased Caligari2 and can't get it to run on amiga forever (no 68000) it won't work with 3.1 roms the software has different programs for 1.3 and 2.04 roms.
yes I know they make truespace ... but its not for the amiga and I have a dctv.
I don't have any accelerators and don,t know if they are worth it for me. I know the program will use a 68020 but I don't know if it will work with something faster.
would you try getting a 2000 motherboard or hype the 500 and how would you go about getting the parts?
does anyone think the motherboards in the pics below are repairable/usable?
does anyone know what a AST Megaplus II card is for?