I've used a wine kit before, and it makes a decent mead. It's been a while, but I think I shot for about equal amounts of fermentables from the grape concentrate and honey. I used a Gewürztraminer kit, and I think most white wine grapes will work well if you match the mead style to the grape style. For red grapes, I'd probably stick to more fruit-forward varietals like Zinfandel, Shiraz, Sangiovese, etc.