I've actually been on this mission myself lately for reasons of my own...
I'm going to give a slightly different opinion. I do not recommend any Winning headgear for "brain" protection. Winning, IMO, is for experienced and high level athletes because of its minimalist design. Winning is about comfort and fit in addition to the protective aspect, in my opinion. Other than the face protection, the FG-5000 is kind of limited in other departments, specifically back of the head protection. The side protection isn't great IMO either.
The forehead has always been described to me as the "plate." meaning it's a thicker, more protective part naturally. So, to me a face protector, especially one that doesn't offer much protection anywhere else isn't satisfactory. I looked for headgear that offered complete protection. What I came up with was this:
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Winning FG series is not satisfactory for "complete" protection, and should be for high level athletes. One of the amateurs at my gym got injured wearing Winning because the guy he was sparring lacked control and hit him with a few rabbit punches to the exposed back part of his head.
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Cleto Reyes fits in the same category, nice side padding, but no back of the head padding.
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Rival D3o is one of the best complete protection headgear. I researched a lot about this headgear and decided to go with another that I'm going to list. When i went to another gym to spar an athlete there had it and it was awesome. To me, it's one of he best "brain protective" headgear I've ever used**. I cannot comment about the quality of the foams because my time with it was really short, but the athlete looked much more comfortable, relaxed, and in less pain when receiving shots when compared to the other guys wearing cheaper headgear. It offers very little, if any nose protection, has nice thick forehead padding, good visibility, good jaw padding, side of the head protection, and an awesome and customizable fastening system on the back that is nicely padded as well.
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Sabas Pro Series Headgear. There's a write up on this piece in the review section. I have sparred with this piece a few times and I've grown to like it a lot. It offers good protection to the nose, cheeks, forehead, back of the head and sides. It's really, IMO, one of the best headgear for complete protection. It has a liner, lace up top and back, and velcro chin strap. The latex is medium density and is great for glove contact sparring, so no elbows and knees; that would require a firmer headgear.
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Title Amateur headgear/ Fighting Sports Amateur headgear/Ringside amateur headgear/Ringside Bomber headgear/ Ringside Masters - I know you said price isn't an issue, but these are lower cost headgear that HAVE to meet safety standards set by USA Boxing before receiving a stamp of approval. They are all 4 layer, laminated foams and IMO very good for complete protection. The amateur headgear has good side, forehead, and back of the head padding, but lacks face protection - even the design with cheeks. The ringside bomber headgear isn't competition legal, but the Master's is and both use the foams that the approved amateur headgear do , but thickens them up. I've seen beginners wear the Ringside Bomber and Masters headgear and literally walk through shots. Those two headgear are massively padded and designed for beginners, that for the price, they are some of the finest beginners equipment you can buy in my opinion. At my gym beginners are only allowed to choose from these headgear listed since they provide so much protection.
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Ringside Deluxe Face Saver Headgear - This is the go to face saver headgear at my gym and the local gym around me. Its medium weight, good visibility, and great padding on the sides and back of the head. Has a liner that absorbs sweat and a buckle strap. A pro that comes by my gym occasionally swears by this piece.
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Hayabusa Boxing face saver headgear - This is a piece I haven't tried, but want to really badly. It protects the whole front of the face, has decent side protection, and back of the head padding. It's one size fits all, which isn't my favorite, but it looks easy to clean, designed well, and very practical. Again, I have no experience with this piece.
That's my interpretation of headgear that provides complete protection. It shows just how different people's opinions can be regard what constitutes protective equipment.
Here's some links:
Ringside Face Saver
Amazon product ASIN B006CUDK9UHayabusa face saver
http://www.mmawarehouse.com/products/hayabusa-tokushu-regenesis-boxing-headgear
Sabas Headgear
http://www.sabasfightgear.com/apps/webstore/products/show/6238532
Edit: **"used" was a poor choice of words. i tried it on and it felt like the most complete protection in addition to seeing it used by another boxer