I like the TNG Oberth, looks like a smaller precussor to the STO Deep Space Science Vessels.
My idea would be to have a stylized deflector on the pod, and a 'standard' one on the saucer (Similar to the secondary deflectors on the Nova and Intrepid classes, but to a slightly older style)
EDIT: Hm, unless the warp core in yours is to be in the underslung hull, I'd have the nacelle pylons on the dorsal hull, how about connecting to both like the original?