$200-$250 for an A1200 with an '030 is entirely reasonable, IMHO, even asking on a forum. Anything less than $200 and I bet it sells quick!
Someone told me that they thought their prices had not held up too well, compared to Atari Falcons, TT's and STacy's.
The Atari stuff seems much harder to find, whereas you can still buy a NIB A1200. (I've been casually looking for a nice STe for ages with no luck.)