Old Man's Child is a pretty nice band which sounds a lot like Dimmu for reasons that you have already explained. I haven't heard Vermin yet, but seeing as it has gotten good reviews all over - I'm thinking I'll give it a shot. It's also pretty funny how you know about Anorexia Nervosa, and not Dimmu Borgir (since the latter is so much more famous). But that's just good because Anorexia is sooooo much better!