There are a ton of knives in that price range. Personally, I really like BM knives, so my suggestions for heavier knifes on the tactical side would be the 806d2 (discontinued and a pain to get an any price (let alone a reasonable one) as you have probably figured out by now), 710, 94X (esp 943), 630, 73X, or griptillian (55X) (esp the ritter version), but the list goes on and on (those are just the ones that came to mind immediately).
For a somewhat smaller but still medium duty knife in the ~3 inch range I'd go for something like the 705 or 707 (I'm sure there are many more choices here, as well).
I'm sure many people here will recommend a look at Spyderco's knives as well (I think the military might be up your alley?), as well as those of many other manufacturers.
If you want any more help in narrowing it down, you really need to provide more information along the lines of your preferences on blade steels, blade length and shape, handle materials, locking mechanisms (I'm a big fan on the BM axis lock, myself), and anything else where you have any idea as to what might appeal to you (I'm sure I'm forgetting something).