I started with 104, probably with the masses. I've just gotten a little 96 and am really liking it. I considered leaving the 104 for Bullseye several years ago but didn't. I wanted some colors (pinks and purples mostly) but didn't want to work with what I could afford. (You know, you've got to have some white, and maybe some black, and some clear and then maybe some of this and that for variety.) Still I kind of wish I had. If I had stopped buying 104 and started building bit by bit I'd have another selection by now, instead of a bunch of basics of 104.
Someday I hope to have a selection of both 90 and 96. Not a huge selection, just so I can create. I really like the colors I see.
I've tinkered with boro but I'm not very good with it. I like how the glass works, I just can't get the colors to strike.
Edit to add, I got some Hawaiian Punch from Karin, and I love it. I was thinking it was 96 but it might be 90. I just keep it by it's self by my kiln and only fondle it some.