If the plan is to keep Rondo and if the Love deal isn't likely, then I think it makes sense to acquire Rondo's 2 buddies, Josh Smith and Rudy Gay.
Give Detroit, Wallace/Bogans/future pick for Smith and give Sacramento, Jeff Green/Brandon Bass/whatever else for Rudy Gay.
I know a lot of people don't like the idea of a Rondo/Smith/Gay trio in Boston, but if the plan is to build around Rondo, then I think this makes sense.
Besides, I am thinking Detroit would rather bring back Monroe and deal Smith rather than the other way around.
Also, I don't think this is a bad starting five at all. Also, this means we are back to the playoffs next year (IMO.)
PG-Rondo
SG-Thornton
SF-Gay
PF-Smith
C-Zeller