Need Shock advise

[xjc]

My recently aquired Zuk has shock towers in the front. One shock is missing and the other is not working well. The upper has a bolt through the bushing but the shock can move almost half an inch with respect to the tower.

Here's the questing what type of shock end do I want and what is available.

Also looking for recommendataions on where to shop. I am thinking low-endish, no rancho's in my future.