What's too heavy for one guy, might be just right for another. Buy what you like, carry it, and determine if it's too heavy for YOU. It's the only way to know for sure.
And here's another consideration: If all you carry is a blade, then you can get away with a heavier knife. But if, like some of us, you carry other items in your EDC system (e.g., MultiTool, flashlight, another knife (or knives), pistol, extra mag, etc.), weight becomes more critical.