Needing help replacing my ESC

[DCDetector]

I've got a Starmax MX2 55" and I'm needing to replace the ESC and need some help getting the right replacement. A Internet search shows it having either a 45A or 70A ESC with a 5A UBEC. I find different info on the same plane. I figure to be safe I should go with the 70A? I'm looking at 2 different ones at HK. Which looks to be the best choice and what should I be aware/warned of? Other options?

TURNIGY TRUST 70A SBEC Brushless Speed Controller
http://www.hobbyking.com/hobbyking/s...dproduct=19683

Turnigy® TRUST SBEC ESCs have a very flexible and broadly capable MCU, able to run all types of brushless motors.
The large heatsink and simple PCB layout make heat dissapation consistant, enabling the ESC to be run at its limit, without failure.
The ESC is program-card and transmitter programmable with clear and easy to understand instructions included.
Default factory settings are;
Brake: off
Battery: LiPo Auto Detect
Low Voltage: 3.2v (power down motor)

Spec.
Max Motor Current: 70A
Max BEC Current: 3A
BEC Voltage: 5.5v (Switching)
LiPo: 2~6S
NiMH:5~16cells
Weight: 65grams

Programming Options.
Battery Type
Forward/Reverse
Soft Start
LV Setting (Ignore, Reduce Power, Stop Motor)
Timing (Auto, Med, High)
Switching (8,16kHz)
Factory Restore

Or HobbyKing 70A ESC 4A UBEC
http://www.hobbyking.com/hobbyking/s...arehouse_.html

Specs:
Constant Current: 70A
Burst Current: 100A
Battery: 2-6S Lipoly / 5-18s NiXX
BEC: 5.5v / 4A
Motor Type: Sensorless Brushless
Size: 70 x 32 x 17mm
Weight: 74g
Programming Functions:
Battery Type: Lipo /NiXX
Brake: On / Off
Voltage Protection: Low / Mid / High
Protection mode: Reduce power / Cut off power
Timing: Low / Medium / High
Startup: Fast / Normal / Soft
PWM Frequency: 8k / 16k
Helicopter mode: Off / 5sec / 15sec (Start up delay)