If he wants to play in the western conference, and play for a contender, his options pretty much consist of the Spurs, and nobody else. There's literally no other team in the NBA that's a 'Kyle Lowry' away from being a contender. And, even with San Antonio, that's only if Parker's injury turns out to be career-ending.
There's six teams in the west that Lowry would be an upgrade over their current point guard (Dallas, Denver, Los Angeles, Minnesota, Phoenix, Sacramento), but Lowry doesn't elevate any of them to contender status; hell, three of them, he wouldn't even elevate to playoff status. Then there's three teams (Houston, New Orleans, Utah) for whom Lowry might be an upgrade on paper, but doesn't actually fit what that team is trying to do. And five teams (Golden State, LA, Memphis, Oklahoma City, Portland) with guards who are significantly better, some of whom have multiple guards who are significantly better. That only leaves the Spurs, and I don't see them paying Lowry what he's likely going to want to get paid.
Unless he signs with the Warriors for the minimum, I expect Lowry to ultimately swallow his championship aspirations in order to take Cuban's money, and help lead Dallas back to the fifth seed.