If you want an album that you can not only write about the lyrics, but also about how they interact with each other to form a full bodied work, I would recomend either RAINBOW or Party Queen. The lyrics are strong, they all together form a large and cohesive point of view on a subject and are (IMO) brilliant pieces of work
Writing about Asfxx and why it made her stand out at the time can be interesting too. But lyric wise you can pick pretty much any album and it will be good.