The sideline reporter is obviously going to depend on who's playing, what time the games are, who's broadcasting them, etc. If the games are on SBS Lachy Reid can't do them, for example, so Redhage would be in place in Perth. Not sure if there are similar clashes in other states.
I love Santamaria as a colour guy, and it irritates me that they try to get him to do play-by-play but he still gets plenty of opportunities to offer insight over the course of the broadcast so it's not a huge issue. Casey would be great if they can fly him in for the grand final. Heverin and Luke haven't been too bad.
Gaze, Hooley, Santamaria, and Heal are all capable, although with Heal it can depend who's playing.
But we can construct these dream rosters all we like, I think we all know Homicide's getting a gig. If Melbourne make it they might be content to put him on the sidelines but otherwise he's going to be in the commentary booth.
That said he's honestly not been that awful this year. He seems a lot quieter. Again, depends who's playing - he's obnoxious during United/Kings games - but there have been games where it feels like he goes minutes at a time without chipping in.