I have a 2004 4cyl Honda accord and I'm having an issue with the front end?

I'm getting a slight vibration at the steering wheel once I hit about 45-50mph and when I hit the brakes, the pedal feels weird. I'm feeling the vibration through the pedals too. I've gotten the wheels balanced and it helped a bit but the vibration won't completely go away. I plan on checking the engine and transmission mounts and the rotors and pads for warping. Is there anything else I should check? If anyone's fixed this issue on a similar vehicle please let me know what the issue was. Any help is appreciated.

Usually if you fee vibration under braking the brake rotors are warped

You should make sure your tire rims are not bent. They should have checked this when you had your wheels balance. I'm thinking your rotors may need to be turned or replaced.

Replace the brake pads and rotors. The rotors are warped.