Has anyone sent out both black & white letterheads as well as colored ones? It may not seem like much of a difference, but it may be a decision factor in my opinion. Professional quality paper + color vs. generic cheap b&w. If you've used both, have you noticed any difference in responses? I'm also thinking about ordering envelopes with full color designs. Should definitely catch attention. The letterhead + envelope combo would cost me a few hundred dollars though. Opinions?