JC man i used to live in Smithville yrs, and yrs, ago when it was considered the country lol.
I would use the reccomended servos whatever that manufacturer suggests can't go wrong there.
If not atleast use the same oz, and whatever else they suggest if going with another brand.
Not much really to decide except brand. If changing just compare apples to apples. DS821's
might do what you want also. JR's brand. I use all DS821's on a similar size plane but with alot more motor
they should do what your need with power to spare.