obviously I've ruffled some feathers, which was not my intention. without wasting too much more time here is my logic:
geometry lifts such as the RCD cantilever the IFS components outside their design spectrum and weakens them. the brake and hub assemblies are also not designed for the oversized tires. all of this is counter intuitive to the purpose of a lift which is enhance it's off-road prowess (even if it's a street queen, the intent is to give that impression which geometry lifts and BL do not in my book).
the financial argument is mitigated by my opinion on the usefulness of the lift because I think it is a complete waste of money but it seems that an RCD and BL would run you about $4,500 installed by a shop and add another $1,500 to re-gear front and rear. So now total cost is $6,000. I'd be astonished if you couldn't source an axle and materials for under $2,000 get a fab shop to do the conversion for under $3,000 leaving you money to re-gear the rearend to match the front.
either way, I'm sorry if it rubs people the wrong way I just feel like a counterpoint needs to be provided. as it was said, if you are only ever going to run it on the street you might not die in a ball of fire and lift pucks but if you ever get an itch to take it off-road look into some off-road enthusiast forums such as Pirate4x4.Com - Powered by vBulletin
and do some more research as they know more than I'll ever pretend to know.
good luck, have fun, be safe.