In order of personal preference:
Entropia
OHBtCL
TPE
Remedy Lane
BE
Scarsick
I'd say the most accessible album is Remedy Lane, most people's favorite is TPE. The first two albums have a similar sound and feel that is distinct from their later works, so don't be put off if you don't like one album, you may like another. Reading the lyrics with these guys is mandatory no matter what album you start with.