For sure, Undertow is incredible. I'm not too crazy about Opiate, though.
I have all of Katatonia's albums and Viva Emptiness is one of my favorites, although they have several great albums. Haha, we have pretty similar taste. I haven't heard of Cave-In, but I'll check them out.
Cave Ins "Jupiter" is one of my all time favorite albums.
Really looking forward to the new release by Palms (Chino Moreno from Deftones and ISIS).