I've played with pretty much any film I come across, and in terms of cost-benefit I've settled on Fomapan films. I like the grain structure, they are some of the cheapest BW film available and have great latitude if you like to mess with stand development. I shot this photo on a Pentax ME camera using Fomapan 100. Developed at home with Ilfotec DDX and scanned with a Canon 5D Mk3 + Canon 100mm f2.8.
I've also settled on Fomapan. I mostly tend to use 200 or 400, but I've also found that pushing the 400 to 1600 to do some night time city shooting is a really fun time.
Yes, I've been messing with shooting different ISOs on the same roll after seeing this video with good results!