haven't read through the entire thread so apologies if this has been said before, but my price for Rondo is either a proven superstar (e.g. Durant lol) or a young player on the cusp of being great (e.g. Anthony Davis or Andre Drummond) but has clearly shown signs of it.
the only time i would "settle" for a lateral move (e.g. getting a Kevin Love-level player), would be dependent on team construct. For example, if we had some budding PG ready to break out as Rondo's backup and had no decent PF, then it would make sense to get Kevin Love because he fills a need and at the same time, frees up space at the 1 position.