Tried a few different masks in my time, first pair I owned was the V-Force Grill; great mask, really awesome looking, lens was easy to change and clean. Foam was a little bit soft compared to other masks which meant it felt more delicate but I never had a problem with it coming apart or anything even after being soaked in water a few times. A minor problem I had with them was the way the sunvizor attached to the mask. Could never get good at wrapping those tiny little rings around the attachments, ended up using an elastic band instead and hey, worked fine for me.
Second mask I've owned personally and use at the moment are the Empire E-Flexes, I'd tried on JT Pro-Flexes before and really loved them but didn't like the way the foam felt and the way the lens was changed. (I like to take my mask apart and clean it all over after I play) When the E-Flexes came out I instantly got them having tried out E-Vents beforehand. Both the E-Flex and E-vents are really nice but you can't beat that breathability you get from the lower half of the E-Flexes. My only problem with my E-Flexes (and it's a minor one) is that it looks very plain compared to some masks like the Grill and the i4's.
A lot of people like i4's, I can understand why: Light, comfortable, breathable and cool looking. Only thing I can't stand about them is that they can leave your jawline a little exposed due to them being quite small on larger headed guys, in my case, my chin would stick out of the bottom of the mask when I opened my mouth. I don't feel too comfortable with that so I don't use them. This is why you should try to get an opportunity to try on a mask before you buy one.