[Wormtongue]

A Dwarf's lust for gold and riches is well expressed in "The Hobbit." Thorin Oakenshield's quest to destroy Smaug and gain the treasure "Under the Mountain" at ANY cost is a just example of the love of all that glitters. If the corrupting power of "the ring" is put into play, the Dwarves would like as not attempt a conquering unsurpassed by the races of Middle Earth. Dwarves may be stout and full of pride and will, but this, exploited by the ring, would be entirely too much for a Dwarf to bear.
The Hobbits, being self-deprecating, humble, and not TOO prideful, seems to me the logical choice. Dwarves are just too damn conceited, as are Elves!