Everything But The Girl - Walking Wounded Solid, fairly deep, clean bass. Good for checking out a sub, but has a lot of electronic sounds and female vocals so it works well for the overall system sound.
BT - Emotional Technology Very complex compositions that run the range. Well recorded. He likes to sneak in some very deep stuff (mid 20s?) when you least expect it
Fiona Apple - Tidal Great recording, sensuous, liquid female vocals, some nice punchy bass on quite a few tracks.
Dave Mathews Band - Crash Nice recording, good variety of instruments, plucky, upbeat stuff and deep clean male vocals.
Seal Both of his first two albums, which I believe are both called "Seal" for some reason. Smooth male vocals, nice basslines, some deep stuff here and there.
Patricia Barber - Cafe Blue I'm not entirely crazy about her vocals, but this Mobile Fidelity disc is amazingly well recorded. A ton of depth and detail. Available on SACD as well as redbook.