I just saw Kayo Dot live here in Arizona this week, and they were amazing! They didn't play any Maudlin of the Well songs, but that was cool because all the new stuff sounded awesome live. I talked to Mia, the violin player, for quite a while after the show, she was pretty interesting. I also got a t-shirt for only ten dollars and had all my CDs signed. Wow!
A band I would highly recommend for a Katatonia fan would be Thought Industry. They're extremely underrated. Another would be When. Also, I'd check out Marduk. If you like Katatonia, you'll LOVE Marduk.