Since you'll be scanning, why not use a clean color negative film like 160 or 400 Portra. They scan really well and have little grain. Since you'll be working with PS, you can punch up the contrast in post. You also will have more control of the conversion to B/W starting with color negatives than with B/W negatives. You can make lighter or darker monochrome tones for each color separately. You can't do that with B/W negatives.