Hi Vince,
I use 35.00 to 50.00 dollar brand name digitals. They are usually about 70 to 90 oz in and I choose Futabe, JR and certain Airtronics. Usually the selection is chosen after speaking with the Masters and FAI Pattern flyers. I have found that we don't need anywhere near the torque that we are often buying when fitting servos in 60 sized Classic Pattern ships. I have had lot's of good service from this middle priced brand name digital plan and haven't any failures in 5 years of flying r/c. ( I use big capacity 6 volt rx batts out of fear, too.
Probably doesn't mean all that much, but that has been my experience.
Chris...