Personally I think all of the 6.0 PSD problems are mostly hype...
My '05 only has 20K miles on it (not a typo)

But my neighbor bought the same truck I did but a Lariat with all the nipple pinchers and bun warmers and he has over 120K on his already, his make a ridiculous amount of HP and he tows a 35' Toy hauler damn near every weekend...
He has an EGR delete kit and no cat and no muffler (not to mention an Idaho license plate

), the kicker is, 10" lift, 38" TSL's and daily driver getting an average of 20MPG unloaded, 12 towing 15,000 #'s and will light the tires up for ten blocks at a time (not making that up)...
My truck had a turbo and a computer flash at 5K miles (I had a friend at the dealer in town

) and never ever have seen the engine light....
I don't know what price range your looking at, but that V10 is the biggest waste of engineering ever...They make descent torque, but at a cost of ludicrous mileage and a maintenance nightmare...

I wouldn't mind a 7.3L PSD, but my wife bought this truck for me and I have never had a new truck before, never had a new anything for that matter...

The 6.0L PSD is a great engine, just don't chip it too hard and keep the oil (full synthetic) and filters changed, run some cetane booster in it and I'm convinced it will run forever....The damn thing makes 350 HP at over 550 ft lbs. and you can't hear it run going down the freeway at 70 MPH...The transmission upgrade alone makes it worth it to me...
Most of the guys I know that have problems with the 6.0 drive like animals and wonder why their stuff is always broke

BTW, with our SMOG laws just brought about, it no longer pays to tune them, you have to go '98 or older to get around it, but you have to do a lot of work to get where the 6.0l is from the factory HP wise...
Maybe just me...Ask around about the 6.0L some more before discounting it, most of the problems are caused by Jimmy Johnson wannabe's.

edit; The absolute hardest part for me to digest is that you guys say to buy a 200+K mile 7.3L before a 6.0L with under 100K, you guys are on krack...

The later 6.0's are set on kill

GT