buy a cheap one u get what u pay for unless you try it yourself and risk losing your money in trial and error.... I fell into that trap.. I bought 2 high priced servos and they were perfect from day one and havent let me down once... its been 3 years and not a problem....
For touring the faster the better and torque well get the highest you can... simple... dont need to much torque to run in any on road car but if u wanna use it in a offroad car or something else make sure u get the right one to do both jobs