Haha, the joys of the DPF.
Well you would have received delivery by now and making excuses to go for another drive. I hope it serves you well.
Apart from a radiator cap which was begrudgingly replaced by the dealer under warranty and a rear uni joint, the only thing that let me down on the D40 was the DPF. The DPF has gone now and replaced by a DEA 3'' system but like a lot of aftermarket exhausts I have had, this has led to problems with the dump pipe fracturing most of the way around, after about 40,000ks. I should have just gutted the DPF and kept the original exhaust except some of thr DPF internals found their way into the muffler when it failed!
The Nav wasn't a great tow vehicle for our size van so only gets driven occasionally but the replacement Yank ute also has a DPF and uses Adblue. Fingers crossed that there are no issues down the track. If Nissan sold a RHD version of the Titan with the Cummins in Australia, I would have considered that.
I have never really looked at the Amarok but they don't seem to have changed much over the years. It's probably not surprising that they arn't as impressive as the Navara. I see that the biturbo is 140kw and 450Nm. Nice.