Just to be technical, if you add nutrients and energizers it is not a "Show Mead" - that term being reserved for meads made with only yeast, honey and water. What you will be making is referred to as a traditional mead. Show meads are finicky and can be difficult to ferment without special care, so I'd encourage you to stick to the traditional and use the nutrients.
Try Bee Folks for some great honey (not cheap, but great).
As for varietals, Tupelo, sourwood, blackberry and raspberry can all make great traditionals. Many folks like Mesquite. Meadowfoam can be good, but I haven't been able to make it as a dry mead that I was happy with. YMMV.