I think New York would favor a meeting with the Heat for various reasons. In terms of 'superstars' this series would have it all, something the NY crowd would definitely be hyped for. Furthermore, from a Knicks perspective I could see arguments for Melo/LeBron matchup being a wash, Stoudamire/Bosh matchup slightly favoring the Knicks, while Wade would obviously dominate Fields. However, the remaining 'depth' of the Knicks is still superior to the Heat, or at least that is how I perceive it.
The 76ers have a 3-1 record against the Bulls I believe, however, I doubt they'd tank to the 8th seed, just to face them. They played us rather well in the first 3 matchups, so if they are not indifferent about their potential matchup, I'd think, even though they were just beaten, that they would favor meeting the Celtics.