The question of how much money we're going to have to spend is a complicated one. Assuming we add nobody, nobody opts out, and we extend Rondo a qualifying offer, here's how our cap space would look next summer:
KG: $18,866,934
Pierce: $21,513,521 ($20.7m cap hold if he opts out)
Ray: $20.7 cap hold (if renounced, $457,588 roster charge)
Perk: $4,890,208
Scal: $6,827,586 cap hold (if renounced, $457,588 roster charge)
Tony: $ 5,000,000 cap hold (if renounced, $457,588 roster charge)
Eddie: $ 5,724,000 cap hold (if renounced, $457,588 roster charge)
Rondo: $6,284,766 (could change if the Celtics sign him to a contract)
Giddens: $1,100,640 (option; must be decided by 10/31/09)
Walker: $854,389
Cap hold: $457,588
Cap hold: $457,588
So, assuming Pierce comes back, and we keep Walker, but assuming we renounce all other free agents, we're looking at:
KG: $18,866,934
Pierce: $21,513,521
Perk: $4,890,208
Walker: $854,389
Rondo: $6,284,766
Cap hold: $457,588
Cap hold: $457,588
Cap hold: $457,588
Cap hold: $457,588
Cap hold: $457,588
Cap hold: $457,588
Cap hold: $457,588
--------------------
Total: $55,612,934
As discussed previously, that's not looking so great, if the salary cap is around $58 million in 2010 (which assumes that revenues stay flat, rather than declining further).
Now, if Paul opts out, and *immediately* agrees to a $10 million salary, here's what we're looking at:
KG: $18,866,934
Pierce: $10,000,000
Perk: $4,890,208
Walker: $854,389
Rondo: $6,284,766
Cap hold: $457,588
Cap hold: $457,588
Cap hold: $457,588
Cap hold: $457,588
Cap hold: $457,588
Cap hold: $457,588
Cap hold: $457,588
--------------------
Total: $44,099,413
With a $58 million cap, this *still* leaves us only $14 million below the salary cap. A "max contract" for somebody of Lebron's tenure will be roughly $17 - $17.5 million. That means to create that much more cap space, we'd need to get Paul to agree to take a pay cut down to $7 million or less.
Of course, as winsomme says, the team could also clear Rondo's salary. By trading him for a future draft pick, or for an expiring contract this season, the $6.2 million cap hold would disappear. Also, Rondo could forego restricted free agency (which would be a terrible decision for him) and immediately decide to play for the $3,018,783 qualifying offer (which would reduce his cap hit by about $3 million). Last, Rondo could resign with the Celts (or they could match an offer sheet), which means his actual contract would count against the cap.
I know that's confusing, but the most important thing to take away from this is that the only realistic way we can keep Pierce, Rondo, Perk, KG, and max free agent is to have Pierce agree to play for roughly $6 - $7 million next season (meaning a $14.5 million pay cut). I can't see it.