A torque wrench capable of reading the ranges you will need can be had for anywhere from ~$20 to ~$80. Check at Sears or Pep Boys for a "beam" type lb-in torque wrench - maybe around $20-$30.

I personally prefer the "clicker" types because you don't need to be able to see the torque scale when in use.

'95 Contour SE, MTX, Champagne '03 EB Expedition, Med Wedgewood Blue