[neallewis]

SC1258 will be fine for 4wd as well as in 2wd.

SC1251MG is obsolete and was replaced by the SC1252MG, faster with higher torque. May be ok in 2wd with a servo saver, but will break gears without, and no good for 4wd.
http://www.rccarshop.co.uk/index.php...tal-servo.html

Savox are a bit power hungry, so make sure you have a decent BEC in you ESC. Also there can be issues with spectrum radio gear, mitigated with a receiver power cap: http://www.rccarshop.co.uk/index.php...protector.html

I'll be honest, after using other servo brands, I'd certainly recommend them over savox, but plenty of people use savox with no problems at all. You do get what you pay for.

Have a look at:

Xpert-RC Brushless Servos: http://www.rccarshop.co.uk/index.php.../xpert-rc.html
Tresrey: http://www.rccarshop.co.uk/index.php...s/tresrey.html