ESEE/RAT makes great knives, I'm not crazy about the coating but everything else on them is great. Simple, practical designs, good steel, well made sheaths and a great warranty. You can get an RC-6 for around $100, I'd recommend that one or an RC-4. I'm not crazy about the RC-5, it's too thick and the sabre grind doesn't perform as well as a full flat grind.
Fallkniven is another brand you should look at. Depending on your blade length preference you can go with an F1 (4"), S1 (5") or A1 (6.3"). Any of them will serve you well. I tend to favour smaller knives, and the F1 is one of my most used tools.
Bark River has a ton of really good models, a few of them are in your price range. I've been beating up on my Fox River for years and it keeps coming back for more. Amazing hunting knife. All the ones I've got have blades around 4", but I'm sure there are larger models available.
Best bang for your buck might probably be Becker knives. A BK2 Campanion (5" blade) is a heck of a lot of knife for around $65. I've been testing a BK9 (the largest model, 9" blade) and I'm very happy with it. It came sharp, properly finished (I expected less) and the sheath is quite good.