I know how you feel... I have been trying to figure out what shocks to order for my lifted VX with growing tires. If you can stand to wait until June, you can get 1 free Rancho shock with the purchase of 3 from Sam's Offroad - http://www.samsoffroad.com/ranchopromo.htm
The wheel travel in the rear is limited by the shocks - longer shocks help regain downward travel after adding the lift (must add a brake line extension and secure the coils to their mounts though). Also, on the compression of the shock it is important the shock does not bottom out before the suspension does - this is when you hit the bump stops. You can trim the bump stops to improve stock ride so that you are not riding on them but I can not guarantee the tires won't contact the body after doing that. On that note, that is why you don't want to trim the bump stops after adding larger tires and you want to instead increase the overall length of the bumpstops to compensate for the larger diameter tires. I drove around for a while without bumpstops because one of mine fell apart and I did not know. My damaged rear wheelwells with missing rivets and shaved plastic tell the end of that story.
Ball joints: After lifting the VX it becomes increasingly more difficult per inch to get an alignment. Flipping the ball joints changes how things line up slightly to allow for easier alignments. Mine have not been flipped yet - if I lift anymore they will need to be.
My confusion comes from the added unsprung weight of bigger tires and the ability of the shocks to control them. I am not sure the 9000's will do the best job with such mass... so what will?
Sent from my "two hands on a keyboard"