The joy of 20:20 hindshite
AA Relay anyone? Usually pays for itself time & again in the first year or two of ownnership until you work out what's going to fail next and make sure you're one step ahead

Once you know the beast well enough, then you can decide to keep AA or not.
I would hope to recoup a bit on the brand new turbo via good old eBay
AAZ could have either a 3-bolt or 4 bolt turbo flange (hence needing the JX manifold if going for a low turbo JX miounting)
Pros & cons are having to make up a slightly different exhaust pipe to keep the AAZ turbo position
If it has the 4-bolt or you go JX, then keeping a spare turbo is a good idea... it's one of the weaker areas and oil pressure is dependent upon the turbo (not doing its bearings or seals in).
Wait till it's all running nicely for a month or two before flogging it, adn then try to have a spare of some sort stashed away!