1. I&W - I feel it to be their most consistent album up to date, save for maybe SDOIT. It contains five phenomenal, energetic tracks, and the rest of them don't fall that short either. It's not as matured as their later production, but I feel this to be the most inspired.
2. SDOIT - Arguably the second most consistent or the most consistent of their albums. Blind Faith, entire 2nd disc, TGP, Misunderstood; some of their most solid work up to date and rocking drumwork. Mixing is right up there.
3. Systematic Chaos - the controversial bet. But I really feel this album to be a consistent one. ITPOE pt.1 starts it off very nicely, then Forsaken kicks in with the rocking guitar riff. Also contains POW, which I don't like at all however. Repentance is boring as well.
4. FII - Peruvian Skies, Hell's Kitchen and Trial of Tears. Especially Peruvian Skies. Lines in the Sand as well. It's not one of the most consistent ones - New Millennium is a little boring, and Take Away My Pain too cheesy-feeling for me - but phenomenal where they get it really right.
5. SFAM - Very consistent. I placed this at 5th because very few of the songs, I feel, aren't their top notch. They're consistent and fit the concept extremely well, but on their own they're a little queer. Overture 1928 is a nice rocking tune, A Strange Deja Vu contains one interesting bit and then it's just cheesytown for me. Only exception for phenomenal songs is Home. I love the eastern guitar influence and the wah-wah theme riff.
6. ADTOE - Breaking All Illusions, Lost Not Forgotten and Bridges in the Sky made this album for me and deserved place 6.
7. Awake - Contains some great stuff but is very inconsistent and I dislike the sound world. It's somehow very raw.
8. ToT - Stream of Consciousness and Endless Sacrifice.
9. Octavarium - Octavarium and These Walls make it for me.
10. BC&SL - A Nightmare to Remember has the most beatiful DT moment of all time in my opinion, in the form of "Beautiful Agony". TCOT is, simplified, half great half lame.
11. WDADU - Afterlife, basically. The Killing Hand is kind of cool as well.
Just off the top of my head, not really set in stone.