I have a 36 inch Zbroz kit on my sled and I love them. There's a lot of great options out there as far as other A Arms, but I liked the look and quality of the Zbroz. I had the local sled shop in the area install it because of the ball joint, but you could take the stock arms to a dealer and have them press it out for a small amount of money. Thats what a buddy of mine did.
As far as the shocks and spindles go, you can run stock shocks with the kit. I do that right now while I'm waiting on my Exit shocks from ZBroz. Haven't noticed any negative change in performance, so I'm satisfied. You will need to grind down the spindles where the lower arm attaches, otherwise they will bind when you put pressure on one side or the other in a carve. I solved that problem by buying new spindles, but grinding them would be a two minute job.