what did you go with?
I have the 61.44fmw compressor wheel and 68mm turbine on my commonrail as the secondary with a 595 as the primary. My truck makes 1200hp and has gone 10.70's at 130mph in the 1/4. The secondary is not a restriction in my experience. the 72 only comes in the 87mm turbine. I'd run the biggest T6 housing you can. If you want the bigger turbine wheel then go with the 76 which will get you the 96mm turbine.