I'm personally going for the boss' this year.
I had union forces last season, thatgot stolen with my old board :'(. But to be honest I didn't care for the forces, they were just good, but not "THIS IS THE NUMBER 1 BINDING RIGHT NOW" good, which everyone was saying last year.I wouldn't say don't get them though, they still did the job well.
I was thinking of either fluxes or romes 390 boss but the way they make the boss sound, it just seems awesome. Flux is flexible because of the plastic and has one of the lowest return rates in snowboard companies. Fluxes big talk is pretty much plactic, and thats what makes it different, other then the tooless adjustments. Rome has more than flux but it's just aluminum, that doesn't mean it can't flex though. You nor I will probably even notice that much of a difference between the two. Other than that those 390 bosses have like a wedgie system that ride has, i like that (look it up if you don't get what i mean). Oh and it has the foot bed, which may not seem like anything but after riding two seasons without one and then riding those union forces with a footbed, it was just so much more comfortable. And if the pro's use 390 bosses then i think they should be good in park lol.
Flux is fine to get though, it really is just a toss up, and i think you should be fine with either. At least thats how it is for me now. Besides, my buddy has flux now anyways so i will just borrow his board and try them out =P, so win win for me hehehe.