If you guys like Marco's voice you should definitely listen to Tarot, which is kind of like Marco's band. He's been singing in Tarot way before he came to NW. I was at Tarot's gig last summer (it was a summerfestival and I saw Marco in person and he asked me where the foodstalls where, you bet I was like "OHMIGOSHHHH!!!"
) and it was fantastic. Of course Tarot is a bit darker and harder metal than Nightwish -especially now with Anette the PopPrincess.
I kind of dislike Anette and I don't like her voice one bit, but it has nothing to with the fact that she doesn't sound like operatic-Tarja. I'm still going to Nightwish gig on summer because I've heard that Anette is great live etc. so if it's not good I can at least say I tried to like her. And I'm happy to pay 44€ to get to see all the boys from NW and hear Marco sing. If Tuomas would sing in the Beauty And The Beast again I would definitely pay more to see and hear that!
