I really like the color of Fuji Reala, but the grain looks weird and I haven't gotten as much detail with it as other films I use. But its the only C-41 film I've used that gives a real pure blue sky that looks like slide films. I like the palette of Fuji's Pro160S/NPS pretty well too, but Portra scans a bit better for me.
In the 800 speed films, Portra 800 and Kodak's Ultramax 800 have the same print grain index rating, but the 400 speed films are noticeably better. If I just needed ISO 800, I would typically choose to shoot ISO 400 at -1EC versus ISO 800 at box speed even though the colors are a bit muted.
My favorite all around film is Kodak's HD400. It has finer grain than the current Portra 400NC, great detail and nice colors. It can still be found at B&H for about $3.50/roll. I talked my local shop into carrying it.
I have mixed feelings towards Ektar. The grain is indeed very fine and it captures detail quite well, but there are some things about the palette and contrast that I'm not fond of. I think after I've shot a dozen rolls of it, I prefer the old UC100 or the Portra 160 films.