I just bought new wheels and tires before I even drove my "new" subaru a foot, so I don't know how it drove before, but as I am driving, I notice a moderate shimmy in the steering wheel. I am going to be replacing the ball joints, could probably need some more shocks. Any more suggestions?

were the wheels/tires balanced? rotate tires and see if the vibration changes. keep an eye on the vibration as it related to speed, braking, accelerating, and coasting. there are many possibilities, the inner CV axle joint is very prone to causing vibration.