For your application I would suggest the GBC Kanati Mongrel Radial for no lift get 26" but I would at least do a 2" lift or just forward a-arms and 28". They will do better in the sand than a Super Swamper and ride and wear good on pavement.

Would I just need the a arms for the front, or the back as well if I went the 28" route?
Probably not as good as your Motogrips in the mud.are the Mongrel's reasonable for the mud? I do go through the mud on occasion, but if I can I try to go around.....I just don't like to clean it!