I like Portra 160, really nice film, but don't rule out the 400 speed color films until you give them a really good try.

I use lowly Superia 400 regularly and love it, Portra 400 is in my fridge and really sweet too. They print to 12x18 really quite nicely for me and are easy to shoot. I'll happily shoot 400 speed C41 films from the equivalent of EI 50 to EI 800 if needed but most times I just stick to 400.

The other thing that C41 films have up their sleeves is that extra exposure reduces grain and 2-3 stops of extra exposure is normally a breeze, no film development changes needed just adjust at the enlarger.