We currently have 36 talismans, and there are definitely at least five from the list above I am interested in adding (Going Their Separate Ways, SNOW JOKE, Worra load of old blocks, With a twist of lemming please, SEGA Four) so I think we will go past 40, in which case the next "nice" number to aim for is 48. That doesn't seem unrealistic, as the max saved challenge and my own contributions to SYCLW will provide other ideas.
Since I like the bronze-silver-gold split to consist of "nice" numbers as well, there are two main options I'm considering: keep the current 1:2:1 ratio (so, 12 bronze, 24 silver, 12 gold) or go for 8 bronze, 24 silver, 16 gold. I think I'll decide first on exactly which talismans we are adding, then choose one of these ratios and then consider the rank of each talisman, but feedback on both the selection and ranking is welcome at any point.