This are dick-ish obvious examples (ones that you probably already thought of), but since I'm a bassist, I can't help but appreciate this thread!!
-Primus
-Cynic
-Gordian Knot
-Aghora
-I can't help but like the bass lines on "A Pleasant Shade of Grey" by Fates Warning. They are very simple but fit the mood of the album perfectly and stand out well.
-Dream Theater, especially their earlier stuff ("Status Seeker!!")
-I'll probably get a lot of flak for this, but I think that the bass tone on the "Clayman" album by In Flames is excellent
-Nevermore
There are lots more (prog wank-fest type bands) but I can't think of them right now.