I, too, have a mixture of alcohol markers (Bic, Sharpie, Copic, Spectrum Noir) because I am trying to keep the cost down. One thing I just learned about the Spectrum Noir markers: DO NOT STORE THEM ON END. They should be stored horizontally. This comes directly from Bindy, a customer rep at Crafter's Companion in response to an email I sent regarding how to store them:
"No you do not want to store them vertically, they should always be stored horizontally. That way the ink flows evenly from one tip to the other. If you store them up on end the ink could pool at the one end and make a blob on your work."
I know that Copics can be stored on end. I just assumed that was true of all alcohol markers. I'm glad I asked, but now I have to re-think a budget way to store my Spectrum Noirs.
Hope this helps you all. Oh, by the way, I like the Spectrum Noirs.