I have the Denon DL-110, AT-95E, AT-440-MLB and the AT-150-MLX.
AT-95E - Budget, yes, but it has to my ears a delicious "Juke Box Sound". I love it, and use it to test "new" used albums before spinning them on the turntable with the better cartridges.
AT-440-MLB - Much more detailed than my lovely green monster (AT-95E). The bell in "Dreamer" - Supertramp sounds like its live in the middle of my living room.
Denon DL-110 - Does everything well (note its a High Output Moving Coil, not a MM). I find myself listening and thoroughly enjoying the music without being awed and distracted by the occasional artifact like the bell above.
AT-150-MLX - Is the price hike over the 440-MLB worth it? Yes. Difficult to describe why, but if you hear it you will "see". Extremely finicky with the protractor setting. A fraction of a millimeter off and it sounds terrible. Just right and it sounds superb.
Given that you already have the AT-440-MLB, I would recommend you invest in a Denon DL-100 (elliptical). Trust me, you will like her very, very, much.
Best from the Pampas,
"Be civil to all; sociable to many; familiar with few; friend to one; enemy to none." Benjamin Franklin