I'm sorry, I should have specified I was referring to color negative film, though it applies to black and white as well.
I used to avoid 400, but don't think I need to anymore. I still prefer 100 (and Kodak Gold 100 was my favorite consumer film for pictures with people in them).
Oddly, I've found myself drawn to black and white the past few years. Perhaps it's because I'm beginning to see photography as more than simply capturing a moment.
Color is still my medium of choice, but I've gained a greater appreciation for black and white, and have been shooting it more than in the past. Last summer I included black and white film on my vacation, which is something I'd never have done before. Both capture equally valid, but uniquely different, representations. I also suspect the more B&W I shoot, the better I will become with color as well.
I have shot Portra in 35mm 160, but have some Portra 400 in 120 I picked up from Loomis Camera in Elyria, Ohio. (They closed in October.) I've only an old Holga 120 format (purchased long before the "Lomo" thing started) and probably should not wait for a good medium format camera to fall in my lap, lest the film expire.
I've shot some Ektar in 35mm and quite liked it. I've also had great experience with the "new" Velvia 50. These two films, however, have taught me I really need to get better. The images I took were quite good, but I can see that more experience would make them great.