Take Great Fortitude. It's better than Toughness, IMO. The fortitude save is also used for certain nasty spells (Flaying, Horrid Wilting, Harm, Slay Living, Destruction, some Symbols). Don't forget, one of the best perks of a monk is that you can usually blast away without hurting it, in which case it might have to save against spells cast by your own party.
I'm not sure if Dash stacks, but it seems it should (adds 10 ft per round to movement rate); however, how will you tell?
I do agree that Blind-Fight fits RP-wise, but when will you use it except against drow and Viper's Fang assassins? Maybe that's worthwhile enough to justify taking it, in light of the lack of options.
Personally, I boycott Toughness. Instead of 3/3/3/3/3 for a total of 15 extra HP for 5 feats, I think it should go up with the number of feats allocated to it, something like 3/6/9/12/18, for a total of 48 extra HP, which would actually be worthwhile. There's really no benefit to the feat as it stands, because those 3 extra HP only help when the tank is nearly dead (and if that occurs, 3 extra HP aren't going to buy you much time).