Sure, you know Shure, the audio company best known in the consumer realm for its line of high-end, in-ear buds. The company's moving out, introducing three new over-the-ear headsets said to offer "professional" audio quality at prices that are a fraction of some of the other cans we've seen lately. The SRH240 are the lowest-end, intended for "consumer listening devices" (i.e. that knock-off MP3 player you got down on Canal Street) and expected to sell for under $60. Next up is the SRH440, positioned for console and DJ use, and ava