I ended up getting a spot/flood combo light bar from 4wheelonline, and it seems to work well. But to answer your question, the most common configuration I've seen so far is having the spotlight on the driver's side and floodlight on the passenger's side.
I put BFG KO2's on my jeep wrangler xd wheels two months ago. These tires are great on dirt trails and soft sand. They are not too noisy on pavement also.