We probably won't get D Wade, he's already stated that he's probably going to stay in Miami and they have enough money for 2 max free agent contracts. If he's not going to stay in Miami, then the Bulls are most likely going to get him, they have more than enough cap space, plus he'd be playing in his hometown of Chicago with Derrick Rose.
Lately, it seems the chances of getting LeBron are becoming slimmer and slimmer. Right now, the Cavs have a good shot at the title, but things could change, as we saw last year.
Chris Bosh could leave Toronto, but our biggest competition for getting Bosh would be Miami, they have no PF for 2010 and have nearly as much cap space as we do. Miami already has a solid playoff base, with Bosh and a few other pieces, they could win a Championship. So, its tough competition.
The most likely thing is we will get Johnson. Hopefully we can get Bosh.