I consider any team that would be favored in at least 3 playoff series to be a legit/true contender to win the title. This year, 3 teams fit that bill. Golden State, Houston, and Cleveland. I believe it is just too difficult to realistically win 2 playoff series in which you are a clear underdog. Now if a team is basically in a toss up series, you could elevate that team to true contender status, so San Antonio might get there this year if they look like they are about even with Houston (still behind GS of course, who is clearly and rightfully a heavy favorite to win the title again). Boston or Toronto could also get into a toss up type situation with Cleveland if they made the right moves at the trade deadline (I don't think Washington or Milwaukee has the ammunition to do so, but I suppose they are theoretically close enough that they could as well). I don't think any other western team can make moves necessary to get them realistically past the 3 rounds in the west and then the eastern team. Obviously injuries or player surprises (both good and bad) can also come into play, but as of right now I consider only 3 teams to be legit/true title contenders.