Passenger side drop adds a complication or two, but uncomplicates so many other things. It's worth it. I have to build a new front driveline anyway, adding a pillowblock to make it two piece is not that hard. The axle needs to be narrowed anyway, why not flip it over in the same process?
Flipping the D300 is not ideal, must run expensive cable shifters and make sure fluid doesn't leak out, I don't like that and it just wasn't "designed" to run upside down, which is enough to make me think twice about it. Maybe that's just silly, but that's what I think anyway.
An atlas or stak is expensive, no two ways about it. Some would argue that polishing the D300 is just as expensive, but for me it's "6 of one, half dozen of the other"... I can get a D300 for cheap and add upgrades as I see fit, whereas I can just spend a bunch of money up front and get something similar that's driver's side drop.
Plus it simplifies my exhaust routing, and I HATE working on complicated exhaust. :redneck:
The arguments are compelling though for staying driver's side drop, and I'm going to think long and hard before I pull the trigger on having the axle swapped to passenger side drop.