Depends what he is after, lets face it when he goes to the NBA he is going to be far further from Melbourne than Perth or Adelaide, so could be a good chance to get used to it.
If he is after the best resourced/best run club in Australia with a playoff experienced coach and probably one of the biggest coaching staffs in Australia Perth would be a good option.
As a 36ers fan id love to see him in Adelaide, only 50 min flight from Melbourne, Joey Wright a championship coach, can learn from guys like Gibson (Boomer)and Ervin(former MVP).
If i were him id be tempted to go up to the Hawks and work with Geordie (my fav NBL coach), and there new import Clarke, could be one of the better preparations you could get imo.
Im not so sure Melbourne can offer those things, Anstey is the least experienced/rated coach, but seem to be well resourced and run these days and does have the advantage of staying at home for another year.
Is there anything stopping him training at all clubs through out the year, ie a month at each club and fill a DP spot whilst there? He could experience all different clubs/coaches/environments that way.
Anyway would love to see him play NBL this year, would be awesome, and good luck to him what ever he choses to do.