Update:
The deal has been offered by Toronto, they won't accept a Vince trade without Rose going too.
TO wants SAR and Van Exel, both with expiring contracts. Portland wants to give DA instead. Portland would have to include other players under the CBA (I don't know the details).
It seems like it could happen shortly. I personally like DA over Van Exel, especially considering no superstar would want to come to TO. Who could they sign with the max? Michael Redd? please. Not a max player. The more chances you give Raptors management to screw up, the more they'll ruin the franchise. Just take DA.