http://www.oceanicww.com

It is important that the mask does fit properly. The Ion3 mask is a bit narrower with regard to the mask skirt and I would say that it leans a bit more toward narrow yo average size faces. The three windows do allow for a bit more peripheral vision and light penetration. The single front lens does offer a decent field of vision as well. The ultra dry snorkel is one of the best dry snorkels that I have used (yes I use a snorkel every time I dive). I had to loan it to a divemaster in Belize when he had to chase down our dive boat when it broke away from it’s mooring line (The crew member back on the boat couldn’t get it started). He had a long swim to get to the boat and as I looked around the group, I was the only one with a snorkel.
The vyper fins are great for beginners all the way to the seasoned professionals but they are open heel (strap fins) which require that a wetsuit boot be used in conjunction with them. I work at http://www.visibilityunlimited.com and http://www.snorkelingonline.com (a snorkeling specific webstore) which are manufacturer authorized retailers of Oceanic products.

http://www.buyoceanic.com/locator/results.aspx?zip=60467

I can only speak from the Oceanic equipment point of view as our store does not carry the other items you mentioned. Please realize that no manufacturer out there can afford to make bad equipment and comfort and fit are the primary concerns with regard to any scuba or snorkeling equipment. If you do buy online always check the manufacturer websites to ensure that they are authorized to sell that company’s equipment. Also glance at the return policy on the particular website you are looking at. Ours, for example is here http://www.visibilityunlimited.com/mm5/merchant.mvc?Screen=returns&Store_Code=scuba
Our snorkeling website http://www.snorkelingonline.com (a division of visibility unlimited) may be worth a look see to compare prices.

http://www.snorkelingonline.com/snorkel/Mask-Fins-Snorkeling-Packages/Ion-Viper-Ultra-Dry-Sunset.html