I don't drink instant coffee, but my mother keeps some around for when she doesn't feel like making a whole pot.
She has tested all sorts of instant coffees, and her newest favorite is Taster's Choice House Blend in the single serve packs (roast intensity is between light and medium). Apparently, the single serve packs helps keep the instant coffee "fresher." I usually have already had my fill of coffee before I go to visit her, and since I don't drink instant coffee anyway, I can't be a judge on this one...
Rose