In Flames, Soilwork and Scar Symmetry? Wow. Great bands.
Try some Dark Tranquillity on for size. Quo Vadis and Opeth are also really good.
Something from the other spectrum of metal, Nightwish (as mentioned) is amazing, and they've got a chick singer. Kamelot is great, Blind Guardian is another awesome band.
Something almost akin to In Flames/Soilwork is Children of Bodom. Their new album comes out soon, unless it's already out.
In any case, you can see the video for the new song "Blooddrunk" on YouTube.
