I show 1/2" EMT @ $0.16 per foot and 1/2" PVC at $0.18, plus the fittings are a little more expensive and the PVC conduit requires 3.3 times as many straps, but in the long run, it will hold up to the test of time. EMT will eventually rust out in an agricutural environment.
Care must be taken to provide for temperature expansion and contraction of the PVC pipe, using "frosties" or other expansion type joints.
