Check out this thread: http://www.vehicross.info/forums/sho...ight=lift+wiki
The bump stops are from Energy Suspension and the part number is in that initial list - they also come in black. The poly adds some kick-back that the rubber didn't generate, but it is managable.
Since you are not planning on a regearing for a while I would advise the 32"s over 33"s for the lesser impact on performance. The leverage difference is not an issue in that range IMO. There is a weight difference that has more of an impact - in theory anyway. Acceleration, braking, and handling would be easier to deal with, with the lesser weight. I ran 32.3"s and BFG 33"s measure out at 32" so maybe it's not even a topic of concern. Tirerack.com has weights of all the tires they carry and may help you make a decision in that regard. A set of used 16" aluminum modular wheels can be found for a price similar to those spacers which would give you the offset you want and minimize weight gain. 
Good luck with your search!
Sent from my "two hands on a keyboard"