I'm guessing those 13.5T motors have to be in Roar approval list also ().
I would get the new Castle Mamba Max Pro.
www.rc-monster.com had many of them in stock. That ESC has some advantages over usual ESCs used on onroad touring cars when running stock classes.
Second option - proven and tested is the Tekin RS or RS Pro. Quite reasonable price and has electronic timing option and hybrid drive. It is an advantage in stock racing. You'd want to get the Hotwire interface also to connect it to PC with the USB. Or check if club driver has one and lets you use it.
The hottest ESC at the moment is AE Black Diamond. That's 400$ and hard to get - maybe don't go so crazy yet
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It also has advantages when running stock or low voltage (1S for 1/12 scale).
Novak GTB is good and solid option. LRP SXX is good and widely used. LRP SPX Stock Spec is overpriced but has some extra profiles which imho give more timing advance - advantage when running stock motors. Then there are Speed Passion GT ESCs, KO, Team Orion etc...
It is said that motors don't have too much difference in the end. Having good ESC and any available motor is better than having some ESC and the best motor
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Speed Passion motors are used a lot for stock (new version just coming out) and also Novak. I personally have used Hacker/Losi (the same thing) and was very happy.