I wanted to go with the Melzi because that is what Nophead recommended for the Mendel90 - IIRC from his blog, he started with RAMPS or something similar and switched to Melzi. One thing about the Melzi is it will handle more current for the heated bed, apparently. Also, the Melzi is an "all-in-one" package with no seperate stepper drivers and wiring it up is easier. I decided to go agead and try a Melzi from Elecfreaks. We'll see how it works...once it arrives.
EDIT: this from Nophead's blog:
EDIT: this from Nophead's blog:
Quote
I changed the default electronics from Sanguinololu to Melzi because it includes the SD card interface and fan drive on board and uses screw connectors rather than friction fit. These are the only connectors I have found to be reliable in the long term...