I think M. Spector may be correct about the one-state solution in the sense that it is probably the most morally pure solution (it's democratically based and avoids the nasty concept of a racially-, or at least religiously-, based nation).
As a practical political matter, however, I'm not sure it's as achievable as a two-state solution. There is a lot of political pressure (in Europe, among many Palistinians, and within Israel itself, for example) for a two-state solution. As near as I can tell, there is very little support for a one-state solution (other than among a very, very few Israelis and among Hamas extremists). So, it seems like it would be difficult (to say the least) to get broad-based political support for a one-state solution.
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[b]Eleutherophobics of the World...Unite!!![/b]