I've decided that Ocho Loco is just too bright, especially since I'll be working my way through the 15th Anniversary Set I bought on the Sale/Swap board for a long time yet. I need a replacement Demolition pencil (which is in the Smoked set) but am on the fence about the rest. I definitely don't need more eyeliner, but if I'm already going to shell out $18 for the one pencil I might as well spend another $20 and get five more I'll use at some point, right?
Hmm. I'm on the fence. Demolition & Zero are nice. Smog & Uzi are too light as eyeliner (IMO). I haven't been as into colored liner lately, so I can't speak to Mainline or Empire. I'm usually really good at justification, but I think you'll have eyeliner for decades if you're still working through the UD15 set. There will always be new things I want to try, so stocking up doesn't work for me.