Great thread DY!
I think that Dveykus 4 could have been the best of the bunch, except the quality of the music went way down on it. Instead of actual instruments, the whole album sounds like it was played on a keyboard.
Some of my other favorite albums:
Tzlil V’Zemer 2
Regesh 3
The Rabbis Sons – Halelu
MBD – I’d Rather Pray and Sing