Personally, I'd like to see Alonso win it. My other favourite is Webber, even though I find him the dirtiest defender in F1. Let's hope I won't pass this title to Jaime.
Anyway, regarding the title, any of the candidates would deserve it. If Button (really long shot) wins it, he'll have defeated all the naysayers (me included) that pronounced him dead even before the first race of the season, and will have also beat a very capable teammate to the points. Hamilton has produced some awesome drives, and if he somehow manages to overcome a 29 points deficit and a speed disadvantage in three races that would be (Barney-style) Le-gen-dary.
Similar to Hamilton, Alonso has produced some amazing rides, coupled with some really silly mistakes and a wee bit of bad luck. Beating the red bulls with their qualy advantage surely compensates for Germany (where Massa almost crashed into him 10 laps previous to the incident).
And the real quid are the Red Bulls. I honestly believe that had we had Alonso or Hamilton (or, gasp, maybe Button) in a RB6 the title would have been decided. However, we've had Webber suffer some kind of second driver treatment in silverstone, plus the accusations at Turkey. And Vettel lost some 30 points in the first two races due to reliability issues. To make matters worse, there were some inspired and threatening drivers capitalising from every mistake they made, thus raising the pressure.
Short version: we've seen some great rides, some silly mistakes, some reliability issues and had some scandals thrown in for good measure. Whoever wins it, will have reasons to say he deserved it. Whoever wins it, the not-whoever will have arguments against him. In any case, he'll be damn proud of getting the most contested championship of the last 28 years.
I am not amazed by F1 cars in Monaco. I want to see them driving in the A8 highway: Variable radius corners, negative banking, and extreme narrowings that Tilke has never dreamed off. Oh, yes, and "beautiful" weather tops it all.
"Prediction is very difficult, especially about the future." Niels Bohr