Let me jump in here to help explain some of the details...
First off, price:Ignite
(has soft socks) - $1099Soul
(with or without soft socks) - $899Heat
(with or without soft socks) - $599
We also have some limited sizes of Grey, Black and Navy Souls left which are onsale for $699 currently but these are almost all sold out. (Our webstore is confusing, as soon as 1 option goes on sale it shows the whole category on sale.)
Features:This link is a great chart
explaining the differences.
All 3 suits feature the same high quality T-Zip water proof zips and VentOR breathable material. We absolutely did not cut any corners on materials. They each also offer the ability to go into what we call "stand by mode" where you flip the neck seal down and zip the jacket up. This is amazing for pre / post session use or if you are on a boat in nasty weather but are not worried about going overboard.
The Ignite and Soul both have removable hoods and a relief zipper. The Heat does not. This is really where we saved a lot of money with the Heat as the zippers are both expensive to install and to tape weld to keep dry around the edges.
The Ignite also features cynch cuffs, a higher neck, a waterproof outer zipper and padded knees. Whereas the Heat is very stripped down.
Regarding soft socks, this comes down to personal taste - as you can see in this thread. Personally, I love kiting in the Heat as it is a very light and easily donned suit and I prefer the model with soft socks as I like keeping my feet dry and warm in the winter and it lets me use the suit for things like river fishing and boating as well.
However, our office is a microcosm of the larger kite scene. Many of our staff prefer to use the Soul with ankle seals and we have one guy who swears by the Ignite... so it comes down to personal taste and the features you wish to have in a suit.
The socks are fantastic for keeping your feet comfy and dry, they make donning the suit a breeze too and let you throw a pair of shoes over them if you wish to use the suit in a boat. Ankle seals make donning a tiny bit harder but also give you the option to ride in bare feet or with neo boots and are awesome if you intend to use the suit through the shoulder season. FWIW, most kiters prefer suits without soft socks...
Sorry for the rambling post!
John Z - OR