Yep Sydney should try hard to keep Grant. Ratzsch is surely no chance.
Melbourne, no idea what they will do, but wouldn't surprise me to see two new faces. Dorsey certainly hasn't done enough to be miffed at getting the axe.
Hawks might keep both, but Catron is nothing special and although Ubaka is not a bad option, I think they need a quicker guard who can draw defences out of position more often and get others open shots on that team.
Sixers should cut Warren and might hang onto Simpson, but it does depend a bit on whether they manage to land a starter quality Aussie PG (ie Markovic) or if they try their hand at import PG roulette again. If they are forced so expend one import slot on a PG and Ballinger comes back fitter and cheaper, maybe they go for a guy like Williamson again, who would give them a more versatile guy who can guard those quick opposition big men that eat Adelaide's slower bigs for brekky.