I'm going to assume we're talking about a Touring Car here since it's a 13.5 motor...
The first question you have to ask is, "do I want to carry a laptop to every meeting". If the answer is "no", the only sensible choice is the Speed Passion. This is as fast as anything else out there and has a nice programming box available for about £20 that means you don't need a laptop at the circuit. I ran this at the BRCA GP and had as much speed and punch as the guy who won the meeting. The Irish national champ also uses one (he switched from GM as he got fed up of carrying a laptop around).
The Tekin and GM are both excellent ESCs; the Tekin is very popular and the GM won both BRCA TC classes last year. But you do need a laptop to adjust the timing settings.
The LRP SXX won't keep up with any of these I'm afraid.
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