I agree with those suggesting one of the bigger Gallien Krueger heads (e.g. 1001 RB), these are the first that come to my mind when I think of sharp, harsh, cutting.
Someone mentioned the discontinued Markbass SD 800 / SD 1200 amps. I've heard very positive comments from bassists who use them in a metal setting, one guy told me it's "a Marshall killer." Might be hard to find in Norway, but they should be affordable. Unfortunately, I have no first hand experience with them.
I also agree with the idea of getting a pedal to do the dirt work. The darkglass distortion pedals should be on the top of your list. As someone mentioned, you could wait for the new darkglass amp to hit the streets soon, it has the typicall darkglass distortion sections on board.
If you use a dirt pedal, you could even get a real clean amp like the new Glockenklang Blue Rock, which also has a great drive function. Friend of mine uses it (ok, he's not a metal rocker), it's massive loud and super clear if needed. Plus, Glockenklang are well-known for their great DI out signal if that's important for you.
I briefly checked the Blue Rock a few weeks ago for half an hour and was really impressed. Easily one of the best amps I've ever heard in more than 20 years of playing, but that's quite subjective of course.
Regarding cabs, there's not a lot I could suggest other than 12'' speakers would be my first choice. IMO, they cut wonderfully through most busy mixes.
For the record:
My tonal goals are a bit different than yours. I play mostly Aguilar amps and use 1x12 cabs. I sometimes play classic metal, but not the more extreme stuff.