The good news is that there is a lot of good stuff out there. If you are looking for stuff that will last and will be competitive in most classes, I would be looking at...
ESC - Hobbywing has been the best value for a while (Xerun and Xtreme Stock sensored range) but availability is patchy at the moment. There is a V3 Xerun which has come out but the price is not the bargain it was. If you shop around you should find the Speed Passion versions of the same range of speedos at pretty good prices (the GT and LPF). There are lots of other brands, most of them more expensive, none of them any better than the Hobbywing-based ESCs. HPI will be re-badging the Xerun V3 in the near future.
Motor - HPI Flux Pro is a bargain. Most of the other BRCA legal motors are quite similar, but I would definitely buy one of the motors with adjustable timing.
Servo - You will get a lot of recommendations for the Savox range. It's not my recommendation, they are very power hungry and that can cause problems for the rest of your electrics. A Futaba BLS551 (or S9551) is an excellent touring car servo that will give years of service. Sanwa are a good brand too but rather expensive. I wouldn't waste your money on the £30 "high-performance" servos, they are often pretty ropey, you're better off with a standard Futaba 3003 (which is a pretty decent servo for a slower car anyway)
LiPo - there are very few bad LiPo's out there. The BRCA list is a good place to start, otherwise just look out for a hard case. C ratings are basically made up by the manufacturers now, anything with 5000mAh and 50C+ rating is going to be pretty recent and should be a good cell. I have mostly used IP cells (or rebranded versions of them). One pack should be enough for a days racing if there is time to charge it between rounds, no need for multiple packs like we used to have in the NiMH days.
You're looking at £250+ for that set of electrics. That may seem expensive, but that is the minimum I would invest in electrics to last.
There are cheaper ways of doing it - buy a £100 17.5 combo from one of the manufacturers, stick with the standard servo, and buy a cheaper, lower capacity LiPo - but these might not give you the same level of performance or as many years service.
Hope this helps.
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