Resto haste cap is 3043 and really easy to get in mostly blues since so much gear has haste already and you can just drop some of your least favorable stat(crit) to comfortably reach it. At higher levels of gear crit is even less favorable, you can reforge off a ton of spi, sit at haste cap, and have a very good amount of mastery stacked.
You get 2 sets of stats on each piece to reforge, if you have a ton of extra spi, balance hit cap(do you guys even get hit capped anymore?), and have a ton of spi and mastery left over that can't go to crit due to it already being on the gear you can throw that into haste.
Like I said, it's not black and white due to so many variables.