Yeah Orchid is such an incredible album. Perhaps fans who got into the 'newer style' of Opeth don't appreciate it as much, but I actually got Orchid soon after it's release (luckily..).
One thing about Orchid - you should DEFINITELY try and listen to it with headphones. Each guitar is completely panned 100% to the left and right and it leads to a real intense musical experience. I really miss those long-dreamy melodies swinging back in forth in both speakers.. really great. I also really love Opeth's old bassist, although I've read that Mike didn't like his playing as much.. a shame, ah well.