The high voltage servos can directly take 7.4v for those in 1/8th rallycross that use a Lipo receiver pack meaning there's no need for a voltage regulator. They can still be used at the standard 6v as well though.
The 2270 etc. are more expensive as they have brushless motors in them and to be honest are a bit overkill for 1/10th off road.
The SC1258 is a great servo for buggies, the other option would be the SC1257 which has a little more speed but a little less torque.
There is also the low profile SC1251 which is very popular too, although being smaller it does have less torque so be careful if you're running it in a car without a servo saver.
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