Good to see that someone's already recommended Orphaned Land to you.
If the power metal kind of "heavy" is up your alley, Blind Guardian has been getting more melodic lately and you would probably like their three most recent albums (maybe the other stuff too, but you should start in their later period).
You may, if you're willing to sacrifice some heaviness for REALLY good melody, also want to try Ayreon if you haven't already. Trust me, it's worth it.
I think with ayreon, it's only fair to mention that they don't have a very defined sound. And before anyone gets all prog-snobby on me, just bare with me for a moment.
Ayreon has a style that constantly changes, and some of the albums *are* heavier and some are just prog. For example, INto the Electric Castle is hailed as a masterpiece, and i find it the most boring piece of shit album i've ever heard. However, the human equation and universal migrator part 2 are great.
Also, it's a bit cheesy, but AAL's other project Star One is worth checking out. Maybe Ambeon too if you're into female vocal stuff.
Early blind guardian is much heavier than later blind guardian. The new album is completely worthless, but ANATO is pretty epic. Personally, i prefer the first three because they're very thrash oriented while still sounding like blind guardian.
Edit: Remember that everyone is also going to have their own tastes, and you have to figure out what you like. It honestly sounds like you haven't listened to a lot of metal (maybe i'm wrong) but after you check out some initial suggestions, you'll really take off from there. Read reviews of bands you like, see which bands they cite in reviews and go from there. It's a lot of "research" and i (as well as many others here i'm sure) have spent a good portion of the last few years of my life on the internet and chatting with other metalheads in my area (or globally for that matter) finding new bands that i enjoy. There's no easy answer to any of it, it just takes time to find something that clicks.
