I've had a GRAYT set of US Divers snorkeling gear, and it was bought as a set, but it was so long ago I can't recall the store, but probably was Sports Authority in ATL. MAsk and fins are yellow, and I think they look great and offer high visibility to others while I'm out there.
Definitely get a silicon mask for better fit and more light. The plastic on mine is yellow, and the "lens" is one piece. It seems your field of view is better than masks w/ two "lens" (one for each eye). The yellow seems a bit brighter when looking thru, as many are dark blue or black. Some have a small "side lens" on either side to provide more light and aid in peripherial vision. Silicon will cloud when left out in the sun, so when you're not using it, place it in the shade or under a towel.
Snorkels these days are pretty hi-tech, and most seem to have a mechanism to keep water from waves going down the tube while swimming on top looking down. Most also have an easy method for clearing when holding your hand over the top and exhaling.
I too like the closed heal for snorkeling, although using them for SCUBA in situations of strong current is not recommended as it could get sucked off while kicking against the current. If the water is cold you'd need to wear bootties which don't fit when wearing the closed heal set, so adjustable heals can be handy in some instances. Many of the adjustable heal fins seem needlessly bulky for normal conditions in the Gulf.
I'm keeping an eye out for a new mask myself, as mine clouded after a friend took it to the beach for a week and left it in the sun everyday... The lens is a bit scratched, and so it's not as clear as I'd like. It seems the lens is some sort of plastic with a coating on the outside that scratches pretty easily, so always take care when cleaning the lens.
I 've always loved snorkeling off the beach by our condo in W.PCB. There's usually something fun to watch or find, even when there's not much real fish action on the open sand. It's just so relaxing to go out and swim around in that clear emerald water, especially on the backside of the second sandbar with all that white sugar sand. I just wish I wasn't so freaked about maybe seeing sharks when I drop anchor and climb out of the kayak out there.
wishin' i was swimmin' out there now!!!