sickening klunk
 

When going around a corner turning left on rough roads, the steering wheel becomes shakey, doesn't happen turning right.

Could it be sway bars,rack and pinion, tie arms. Please inform me with any and all causes to this problem and guesstimated cost to fix/replace

I've had a similar problem recently. Turns out it was the ball joint on the passenger side. To determine if this is it:

Put front end in air.
Remove wheels.
Try to wiggle suspension (up,down,left,right)

This shouldn't move. If it does, find where it is moving. The ball joint is part 20206 in the following link:
http://www.subaruparts.com/diag/?mod...category=200-1

Stevesby also suggested that it might be loose brake parts. I would check that as well.
Hope this helps.

The lower ball joint is a good guess. There are a handful of joints and bushings down there that will cause problems like that. Try the lug nuts, tire pressure, and tie rod jam nut.

I'd suggest you jack up the front of your car until the wheels are off the ground as SVXer95 suggests. It may not be necessary to remove the wheels, but try that if you can't determine anything with them on. Listen carefully for a clunking noise of any type. Many shops like Les Schwab or Midas will do this for you for free in the hopes that they'll get to fix it too.

Also, with the car on the ground, you can set the parking brake (don't use the brake pedal) and shift from reverse to drive to reverse to drive... With the rear wheels locked by the parking brake, the front wheels will try to move. If there's a loose part, they will move. By yourself, you can listen for a clunk, which probably indicates a faulty ball joint. With an assistant, one of you can stand outside the car and observe the front wheels while shifting back and forth. You may also drive around slowly with someone walking beside the car watching carefully for anything unusual.