I am in the process of upgrading my T3 to Halogram D as well. Now I am just waiting for cable company to ship me the cable. Now is a good time as cable company is having sale on all of their SR power cords in stock.
Before this, I tried Stealth Dream digital PC on my Playback Design MPS-5 against T3. The sound is a bit different but really nothing that I missed when I switched back to T3. While I am not impressed with Stealth PC, their IC is a different story though. Never heard the Indra but Sakra is something else. At least in my system, Sakra still improves upon SR Apex/IC cells but at more than twice the price. Unfortunately SR has nothing in between Apex/IC cells and its Galileo IC system.