That is a monster of a motor lol. And you will definitely want to run that on 12s. With that said, my suggestion for ESC is something like the the ESC linked below. You have a LOT of money tied up in that helicopter, and I know you don't want it all to go down the drain. I'm sure others will help you out with suggestions as well.
Castle Creations Phoenix Edge 160HV 50V 160-Amp ESC [CSE010-0103-00] | RC Helicopters - A Main Hobbies
Each of the new HK-4525-520KV ULTIMATE motor is wound with a single strand of 1.4mm wire for the highest possible efficiency. This motor is capable of running continuously at an input power of 4450 watts at 100 amps, and can handle peak inputs of 10200 watts and 230 amps for 2 seconds
Specifications
Stator Diameter 45 mm (1.77 in)
Stator Thickness 25 mm (0.98 in)
No. of Stator Arms 12
No. of Stator Poles 10
Motor Wind 5+6T YY
Motor Wire 1-Strand 1.4 mm
Motor Kv 520KV RPM/Volt
No-Load Current (Io/10V) 1.75 Amps
Motor Resistance (RM) 0.012 Ohms
Max Continuous Current 100 Amps
Max Continuous Power 4450 Watts
Weight 503 Grams (17.74 oz)
Outside Diameter 56.7 mm (2.23 in)
Shaft Diameter 5.98 mm (0.24 in)
Body Length 53.4 mm (2.10 in)
Overall Shaft Length 91.5 mm (3.60 in)
Max Lipo Cell 12s
Max Peak Current 230A (2 seconds)
Max Peak Power 10200 Watts (2 seconds)
Motor Timing 5 to 15 deg
Drive Frequency 8kHz
There are no clubs around here and I have not found anyone else who is in to the hobby so I will be depending on this site for a lot of things. Cheers..