Sixers, Wolves, Lakers could all top that offer pretty easily. Nuggets, Suns, Knicks might be able to as well depending on what the acquiring team thought of certain prospects (you know like Porzingis). This obviously doesn't include better teams that have star level prospects. For example, is Kevin Love and Tristan Thompson for Boogie a better package. I guess that depends on what the Kings want.
Knicks would have to be insane to offer up Porzingis for Cousins. That will never happen. Agreed the Lakers could make a pretty attractive offer, but without the high draft picks, which in blockbuster trades, are usually a requirement these days. Wolves could, but why would you mention a team that is all set at the center position? I don't see the Nuggets or Suns coming close to offering a competitive package. Suns won't give up Booker. Who is left? Bender? Chriss?
And the way the Cavs are playing, safe to say the last thing they would consider is trading Love or Thompson.
Cousins is better than Love and Thompson though and he probably gives the Cavs a slightly longer window with a real advantage over the Warriors in the paint. I'm not suggesting Cleveland would mess with their chemistry, but I absolutely think they would consider a Love/Thompson for Boogie/Gay type trade if it was available to them.
If the Wolves think Towns and Cousins could play together I see no reason why they wouldn't put together an offer and could put together a very nice one.
Cousins is better than Porzingis. Cousins fits in better with a win now team and still young enough to give the Knicks close to a decade of solid play. Why wouldn't the win now Knicks offer Porzingis for Cousins?
The Lakers, Sixers, and Suns have a lot of high level prospects. If you give up good enough prospects then draft picks don't matter as much. Randle and Russell for example are likely considered better prospects than anyone on Boston in your traded and while everyone thinks the Brooklyn picks will be very good there is a lot uncertainty. The Kings know what they are getting in Randle and Russell, which probably makes that a better package. Same with the Sixers who could offer any combination of Okafor, Noel, Saric, LAL 1st, Philly's own 1sts, and most importantly they can give Sacto back the full rights to Sacto's own picks. There is no way Boston can top that sort of package.
Boston can certainly put together a very attractive package and if Cousins makes it clear he only wants to go to Boston that would help, but Boston can easily have its package beaten by any number of teams.