The Benchmade 531 is a flat grind. It covers most of your bases except a little high on the price. Before you buy one, I'd suggest that you try one out in-hand first. The ergos are a little different and people usually either like them or hate them.
The Benchmade 530 is a flat grind spear point (picture a dagger point but with a false edge on top), but can usually be found for less than $100. FRN handles vs. G10
Also check out the H&K 14410 and 14411 Soldat. They're getting a little hard to find but they are still generally out there for a little over $50. It comes in drop point or tanto, plain or part serrated.
Blade Length: 3.30"
Grind: Flat
Blade Style: Drop Point
Weight: 2.8 ounces
Steel: N680 (which I think is around a 420HC?)
If you have trouble finding one, shoot me a pm and I can point you in the right direction.
View attachment 590161
EDIT: after a quick check, it looks like only the tanto version is still readily available...not sure what happened to all the drop points...