Flooring Tile - travertine and soundproofing

I'm planning to put a travertine floor in a highrise condo (kitchen, living room, bath) that requires soundproofing. Two options: 1) Laticrete 125 mortar/thinset vs 2) 1/4-1/2" cork underlayment with polymer thinset. Any preferences, experiences, cost or ease of installation advice? My impression is that the one-step Laticrete might be easier to install, but may still be more costly. The subfloor is reinforced concrete.

1) Laticrete 125 mortar/thinset

Im not familiar with this particular thinset, but went to the laticrete website. I did not see any mention of sound proofing. Where did you get your info on this?

As to cork, TCNA requires that the cork be 1/2" in thickness, the concrete slab must be a minimum of 6" thick, tile used must be 8"x8" or larger. The cork must be bonded to the concrete slab. This will provide sound proofing.

Take a look a Noble's SIS membrane. I think this will be your easiest and best solution.:)

http://www.noblecompany.com/Portals/0/PRODUCT%20INFO/Product%20Descriptions/NS%20SIS_PD_0407_lr.pdf

thanks - I'll check it out. The Laticrete was somewhat hard to track down even on their own website and I've either heard really positive things or people haven't heard of it at all. The Noble membrane system sounds not that difficult even for novice like me. I.m planning to use either 16x16 or 18x18 tiles.

You will need a medium bed mortar for tile that large.:)