There are three PGs in the league I would trade Rondo for: Paul, Williams and Rose.
All three will make the Celtics better.
I don't think it's as clear that Williams or Rose make us better as people think. You'll get more production from the pg spot, you'll likely get less production from everywhere else.
Or even Paul. Rondo is tough as nails. Chris Paul sits out a sprained ankle for 1-2 weeks. Rondo plays a season with a broken foot. Rondo brings intangibles.
Rondo has 3 Hall of Famers....who are largely reduced to great jump shooters. His supporting cast is probably one of the weaker ones in the top teams (Rose has a serviceable center and younger guys to work with. Our bench was amazing until injury forced us to trade it all away.) A decent inside scorer (whether it be a slasher or a low post banger) would make Rondo amazing. Just look at what Rondo did with Shaq (or the half Shaq really). Shaq was having trouble scoring in Cleveland just a season ago and Rondo resurrected the man.
Did you just call Pierce, Ray and KG as the weakest teammates of all of these PGs?
I think Rondo has one of the less reliable teammates on the offensive end out of all the top teams.
Rose has Noah, who can get offensive rebounds, and Deng, who can finish at the rim better then any Celtic not named Rondo. Miami is Miami. The Lakers have Bynum and Pau Gasol.
They are what they are. They are three great players who are past their prime who play wonderful defense. They rely a lot on their jump shot now, which is really hard to land when the times are tough, causing offensive stagnation. The other top teams have a lot of different looks, Boston has a lot of jump shooting.
Wow.
That's all I can say.
I don't think I have seen anyone undervalue Pierce, Ray and KG on here this much.
Noah, Deng and Boozer offensively > Pierce, Ray and KG offensively??
Color me really confused with that idea. 
The Celtics were the best team before Quis got hurt. The Celtics went into the playoffs with, effectively, the Big Three and Rondo. At least the Bulls had a center, some scoring on the inside and bench players.
Rondo had the big three, who were playing almost 40 minutes a pop and were exhausted, Jeff Green, who had no idea what was going on, and Jermaine O'Neal, playing one of his first games this year going into the playoffs.
I think offensively, yes, the Big Three can be unreliable
when the offense isn't 'flowing' as they rely on their jumpers, which is really hard to hit when there is no rhythm. Getting fouled and going to the line helps the team's rhythm, which the Big Three can not do so well anymore. I remember so many games where there was a grind out with nobody hitting anything.
I guess what I wanted to say was it frustrates me when haters talk about how Rondo is so amazing only because he has three Hall of Famers and then turn around and write off the Celtics because "they're too old and should be playing wheelchair basketball". I think Rondo has a huge part in the Big Three's production offensively and people are constantly undermining him. Hopefully he learns to hit a jump shot and ends this debate once and for all.