BrownB2 I actually picked up an A600 for the same reason and I quickly realized although the initial cost of the A600 was low the expense of getting it functional was not worth it, especially when the A1200 has many more expansions readily available.
If you're looking for more ram do google searches for SRAM cards. Don't go onto ebay becuase you'll find folks that know they're good for Amigas and charge up the wazzo. I've seen 4 meg cards outside of ebay for $50-70.