I find the combat text for frames with a casting bar and portrait is aligned funny. Its not in the center of the Health Bar, its in the center of the entire frame which makes it look weird (if you know what im sayin)
I personally like the chunk fade look that some unit frames have (nurfed i think). Just a cosmetic thing though. I like the frames to take up the least amount of space with the same info. As a healer deficit of health is paramount, along with debuffs. Recoloring their health bar etc to show what type of debuff they have owns.