yep, you're right about the size and weight increase, but that's one reason why the 2000 sounds better
The 1200 would not load into the 2000 without first saving as 2000 option, so I'm almost certain you'd need that option for the 3000 and definitely for the 7000.
The 2000/1200 was also still a DD disk drive which has to be taken into account if trying to use HD disks for transfers to later boards. If you haven't any DD disks you can tape a HD to look like a DD and format in the 2000. It "should" all then work ok