IF I was going to buy a mask this season, from what's currently available, I'd likely go EVS, but the I5 would be a real contender and it would come down to what was more readily available and in the color I liked.
I haven't seen the PUSH one yet, but I expect it to look very similar to Dye and Virtue given the guys behind the project.
Truth is, I haven't paid for a paintball product for close to 20 years, so I'm having a hard time answering you. Push comes to shove though, I5 or EVS. I like the EVS because it's new, and doesn't resemble anything else too closely, so I feel it's a 'fresher' look. That could be the thing that swayed my decision if I was purchasing.
For the money, all of them are worth it IMO.
I'd rather play with a sweet high end mask and a crappy gun, than the other way around...