Like Jan, I'm not a SU user. I'm far to impulsive to limit myself to one brand that I have to wait for!
I use Stazon ink and Inktense pencils and sometimes whatever else I can get my hands on, not excluding my 9 year old's textas and crayons, acrylic paint, gel pens, you name it.
I don't worry about archival/acid free on cards (unlike my scrapbooking) because most people won't keep them forever.
If you have embossing powder but no 'waterproof' ink, then emboss your image before colouring to stop it smudging.