Embellisher,
Right on, brother! You are about to enter a magical world of amazing bass playing and quirky songwriting. Any day I listen to a Minutemen or fIREHOSE CD is instantly a good day!
As the others said, the Minutemen's "Double Nickels on the Dime" is absolutely essential. It's one of my "desert island" CDs, as well as a treasure trove of unreal bass. My favorite tracks here are "One Reporter's Opinion", "God Bows to Math" and especially "The Glory of Man", but the whole thing is great.
As far as fIREHOSE, there really isn't a bad one. I'd get them all! But, if I had to strip it down to the essentials.. "Ragin', Full On", "If'n", and "Flyin' the Flannel" would be my choices.
I'd also get his solo album "Contemplating the Engine Room." His first one, "Ballhog or Tugboat?" is good, but I like "Contemplating.." much better. It reminds me of a fIREHOSE album.
Watt has also done some side stuff.. a band called Dos that he was in with his ex-wife, who once played bass for Black Flag. It's some pretty cool bass duet stuff. He also did a one-off CD with a group called Bootstrappers, which included Elliot Sharp, who's really out there!
Have fun with all this stuff, the bass playing will really turn your ears around!