I would go for one of Mel Sorg's knives (MadPoet Custom Knives). He uses D-2 and they are heavy duty and VERY versatile. I just got one of his hunters, which has probably a 4.5" blade or so, and I would not hesitate using it for survival purposes at all. Great knife, and I've reviewed it in the review section of BF. His website is <a href = "http://www.angelfire.com/mn/madpoet"> here</a>. His knives are very rustic and utilize wood handles, etc. If you are looking for an ultra-modern, "tactical" showpiece, then I would suggest something else, but these knives are truly hardcore!