Brandon Roy(could of been drafted in '06)
Chris Paul(we wanted Travis Outlaw kicked in)
Danny Granger(Reacquiring Tione pushed us past Indy in draft)
Monta Ellis('05)
Josh Howard(though we would of missed out on the Banks yrs

)
The first three character wise imo would have also made great Celtics. These were just some off the top of my head from the Danny yrs, but going back I'd add Joe Johnson, Billups, Tony Parker (over Forte), Tim Hardaway (over Michael Smith) and obviously Len Bias. Regarding Billups, he didn't "get it" for several yrs and several teams later, so i assume if he wasn't moved in the Kenny Anderson deal, he would have been moved a little later (like Mercer)
For controversy sake I'll say what about Kobe over Tione? (That should get some opinions

)