Sounds like a good plan. I have Indivisions for both my Amigas and love them, would never go back to using an old fashion monitor again.
AmigaKit still sells new ACA 1220 and 1232 accelerators, both of which add 128MB of RAM.
http://amigakit.leamancomputing.com/catalog/index.php?cPath=43You may want to read up on the motherboard timing fixes if you go the ACA route, but from what I hear they're pretty easy to do, or you can send your board to AmigaKit and they can do them also. (if you need them)
Occasionally other types of accelerators pop up on Amibay or Ebay, as other users upgrade or clear out their closets.
