For the more experienced... What medium and bit should I use for this Plaque?

[garthingram]

I would recommend using a hardwood, the harder the better. Oak carves nicely with little chip out. I agree with Berg on the 1/32 bit.
I would also save it to the flash on optimal.
Here is one I did recently that was 18" x 24" carved with the 1/16 bit and some of the detail was lost on the logo.

Thanks for the recommendation Brent. I'll give it a shot and post a pick of the results when complete