Here is a clip of Bro. David Miller, the "Country-Preacher-at-Large". He's not flashy but the man brings solid and powerful exposition of Scripture. This clip is an explanation of God's unchanging nature- a very important doctrine.
--Here is an audio excerpt where Bro. Miller refutes certain popular false teachers.
--Here is a video clip by Bro. Miller preaching on the excellency of Christ.