The Skys Gone Out for Bauhaus. From the Eno cover to the self-contained songs and the The Three Shadows triptych. All excellent. Some versions contain the Ziggy Stardust cover, which is amazing. Party of the First Part is also great.
My favourite Sisters album is Floodland. It is perhaps their first nod to the mainstream, but there are so many *anthemic* songs there. Driven Like the Snow is my personal favourite, along with Ribbons from Vision Thing. Some Girls Wander By Mistake is also great - a snapshot of their early years with some brilliant songs. (Alice is on this compilation, IIRC).
The Mission is also worth investigating if you enjoy the Sisters (IIRC Wayne Hussey of The Mission was either bassist or guitarist in the early Sisters lineup), as is The Merry Thoughts, who were essentially a glorified tribute band.
Skeletal Family are also Good Value.
Thanks! I'll give some of this a listen while I'm working here!