My first impression is that the proposed map for San Diego County (where I live) is not too bad. We currently have three Pubbies and two Dems. I think the new map has one safe Dem, three safe Pubbies and possibly one (mine) tossup. It may in fact favor a Dem, but it seems less safe for my really bad Representative (Susan Davis) than her current district.
I'm concerned moving Davis' downtown district into a reduced Bilbray district could flip it to the Dems. If they went with these proposed lines I'd be drawn into that 'toss-up' district.
I'm not sure about the new district. It looks like it could be a Dem safe spot or closer to toss up as you suggest.