Well, I think you are probably best talking to the people trackside about what equipment they prefer.
If you want something that will last, and perform, you need to spend decent money.
Servos - look at the quality Japanese brands. I have been running Futaba for a while now. Performance of 0.10s/60deg speed and 6kg/cm torque is ideal for electric. Futaba S9551/BLS551 is a nice low profile servo. Or for a full size servo try the S9452/BLS451.
Cells - pretty much anything on the BRCA list is going to be decent. Despite the different labels they all come from only a handful of factories in China. Look at a 5000mAh+ and 30C+ pack, that is the most recent tech. Something like the Intellect IP packs. You might get away with only one pack, maybe two if charging time is too tight.
Charger - make sure it is LiPo compatible. In-built balancing is handy for peace of mind. Avoid the very cheap eBay chargers and their clones, there are concerns about their charging accuracy, they could overcharge cells. Bantam and Hyperion are two well respected brands.
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