If you are determined to only rev it to 5500rpm, then fair enough on the turbo choice.

Nitrous has the advantage of masses gains that are easy to achieve and dont need mappable management or lots of expensive setup time on the carb/dizzy etc.
Disadvantage is its very expensive on an ongoing basis for anything other than drag racing.

So depends what use it will get if thats a good route or not.

Personally I would nitrous it wether your turbo it or stroker it or whatever, I just dont se the point in having a big strong engine like that to go drag racing with and then not use nitrous on it.