I did the conventional multi program, a place in TX, at RBD. Less than 1 week, beat up their airplanes, less the $1K for the rating. You still have to get there, but I highly recommend it. It was called MEI, and you can find them by looking in Trade-a-Plane, or calling the FBO at RBD.
As Pat mentioned, if you ever transition to turbine,
http://www.robocart.com/005/8832700.htm all 337 time will be ME time, not CLT-ME. Also, you avoid tearing up your aircraft, etc, etc.