I used to have a Reventon Pro, but I was not a fan. I'd either recommend one of the Muchmore Fletas (Pro or Stock, I have both and I love them!) or a Hobbywing V3.1. Savöx low-profile servos seem have the toughest gears, but their full-size stuff is said to hold up better. I almost exclusively useFutaba Servos, but also have one Xpert RC and one KO Propo servo each, and I can recommend them all. They are more reliable than all the Savöx and Sanwa servos I used to have.
As for the other stuff, the Yatabe springs and the machined pistons are great, I'd recommend getting them from the start. If you are running on a track with slippery elements, you possibly should consider buying a ball diff, other than that I'd say run the car out of the box for the time being. Various options are absolutely worthwhile on some tracks, but you may not need them on others, e.g. the gull wing front suspension or the B-Max4III rear arms and drive axles.
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