OPTIONS:
Rebuild the boat anchor myself (cheapest and most risky option as I will be learning a little as I go, but I am not afraid of the consequences because the outlay is minimal in my opinion)
Rebuild through Nissan, haven't had a complete costing but initial estimate from the dealer around $7500, I haven't pinned them on how they are going to achieve this as I currently have a distaste for the engine at present.
Engine swap from a salvaged vehicle, Pre-CRD. I will have all the bits I need, I can part the vehicle myself and while a pain in the ass in my situation could substantially reduce my all up costs. The bad is I will no idea about how long it will take to grenade the thing, while I have read about all the mods that have been made to supposedly make the ZD30 reliable, it should never of been up to the end user to do this even if it does work and I have still read of cases where the motor nades itself regardless of the mods.
Engine swap from the same family of vehicles, the TD42 is really my only option in this regard. Finding a suitable motor hasn't been easy as with the cessation of the engine for use, ready stock is harder to come by, and what you do see is mid to high mileage units that need additional investment to get them up and running at decent power levels.
V8 swap, Diesel or Petrol. Kit from a known retailer around 18K for a 6.5D, that is without exhaust and possibly uprated cooling. Attractive and I have been in one and was impressed with the substantial increase in tractability off-road. I have also read many contradictory posts, and opinions on their worth and potential pitfalls. This was my initial intent, but I am not so sure hence the request for sage advice (BRUCE NO I DON'T WANT TO SHOEHORN A DURAMAX INTO MY TRUCK, is there not a Nissan site in the world you haven't got a log in on? )



Petrol, immediate concern is that my GU no longer becomes a touring option (10000Km plus trips etc) and is then relegated to my toy for short trips, I can accept that however on the other hand I haven't seen people with a Gen 3 or equivalent post much information about fuel economy, probably because it was never a consideration in the first place. Its one of mine but only in terms of my intended use, not a show stopper and I am very tempted, should be more cost effective than the 6.5Chev on initial installation, but for me more open to mistakes collating all the parts required if I was to install it myself.
Different make.
Toyota donk, I love their range of large capacity diesels and have always thought them superior to anything Nissan has put in a 4WD, yet it would turn something potentially simple (Just get the engine fixed) into a major money sink chasing the right fit once committed, an area I believe best pioneered by tradesman with the time and patience to make it work. It would be either the late model EFI TD 4200 or the V8 out of the 90 series I would target, again opting for a salvage vehicle as the doner.
So gents thoughts, I have spent the last 3 weeks scanning the various websites making some initial calls, what I am looking for is as at today experiences or suggestions, of which I am open to all (ok yes Duramx bogged if its feasable to road worthy the frickin thing).