Rotational mass out of balance,tire, rim etc will appear in a 10 mph window (like between 70-80). You don't say if it goes away after a certain speed. A bent rim probably,but not necessarily,wouldn't balance with the new tires. You could rotate tires (front to rear) to see if the vibration moves. Also, you don't mention how many miles you have on your car. If you've never had any front end work, you're due. Have a thorough front end check by someone who knows what they're doing. Those vehicles are famous for wheel bearing problems as they get a little long in the tooth. I'm sure it's 4wd, check axle joints. I can't help but wonder how the tires wore and whether or not it's all over the road. A good alignment will not solve a vibration but can't be done unless the front end is tight, so they'll let you know exactly what you need.
Good luck!
