So it seems that the consensus buyout hopes are:
Will Barton
Terence Ross
Danny Green
My initial reaction would be Barton but I looked a little deeper. He is small at 6'-5". 32 years old. Listed as a SF but I think there are defensive issues. His NetR this season is really bad and in particular his DefR is poor. Both EFG% and TS% are pretty low this season (everything is down relative to career averages for Barton). His DefR on Denver was not great, but not as bad as this season in WAS.
Danny Green is 6'-6" and 35 years old. He has declined the last few seasons pretty dramatically (and that was before the latest injury). Not sure what he has left and in particular, if he can still defend the SF position.
Terrence Ross is 6'-7", 32 years old, and actually has decent stats this season in ORL. I admit that in the past, I have been unimpressed to put is mildly. He has a decent NetR and DefR this season on ORL and his EFG% and TS% are both better than Barton (at least this season).
I am not sure if any of these options would beat out Hauser, maybe. Certainly an improvement on Jackson.
Tony Snell (for reference) is 6'-6", 31, but it is not clear why he fell off the map this season. His career stats are comparable to Terrence Ross. Actually career 39% from 3 (Ross and Barton are 36.2% and 35.5% respectively). I don't recall if there was an injury or something.
After all this, I come to the conclusion that we should not rule out Ross. Barton appears really weak on defense and lacks size. Ross is actually a slightly better career 3pt shooter, and both are at 38% this season. As a complement to Hauser, Ross might be the better option. And Snell might actually trump them all.