The answer to your original question is yes, of course you should [emoji4] if you want a tango pearl HH that is going to be rare so your best bet is to order a new one - it will come from the factory set up impeccably so unless it has experienced extraordinarily extreme low or high temperatures it will remain good. There should be no need to alter anything but if there is a minor tweak of the truss rod wheel adjuster will do it.
As for your experience with the musicman neck, another good thing about Musicman is awesome customer service - they would likely have sorted out that neck for you.
I have 7 of their basses and they all have great necks - people are known to set them up badly - the truss rod is the only likely adjustment ever needed in my experience. Their consistency is second to none so duds should not happen and having great customer service should give you peace of mind anyway.
And if you do go for a new one shop around for the best deal.
It'll probably take three months to be delivered but you can choose your colour (though you've done that already, and a v cool one it is too), pick guard colour (I would go with plain black or white with that colour), maple/rosewood/fretless fretboard etc.