It depends how precise you need to be. If a 10-15% margin of error is acceptable*, then most of the budget brands (Presa, Titan, Neiko, ect) will be fine. If you need <5% margin of error, start looking at the major brands (snap-on, blue point, matco, mac, cornwell) that come with calibration certificates.

How many inch pounds you are working with will determine the size you need.

• 1-100in/lb - 1/4" torque wrench

• 100-1000in/lb - 3/8" torque wrench

• 1000+in/lb - We really should be using a different unit at this point, but 1/2" torque wrench.

  *For most shadetree repairs 10-15% is more than sufficient.

Edit: tried to fix formatting