Front end wobble, Ball Joints? Options

[ericread]

When I got my car a year ago, it had a pronounced shimmy in the front end which was very noticeable in the steering wheel when driving on rough roads or at higher speeds.

In an effort to eliminate this, I have done the following:
Re-built front wheel bearings - Noticeable improvement - old bearings were very loose.
Replace tie-rod ends (not turbo) - again, noticeable improvement
Replaced existing KYB front struts with a good set of used KYB struts - huge improvement

Now my shimmy only seems to occur between about 65 MPH and 75 MPH, mostly on concrete roads and rough roads. Then concrete roads are probably noticeable because of the cupping inherent in heavily traveled concrete roads (i.e. 405 in SoCal).

So what do you think. At speed it feels like a significant out-of-alignment issue. Will bad ball-joints create this problem?

My thanks in advance (IMG:style_emoticons/default/bye1.gif)