Well Wags there are about as many way to acomplish nitrous or turbo as your imagination will allow. IMHO you'll have to decide on the major aspects.
Do you want to keep any creature comforts?
Obviously much easier to do with nitrous unless you spend big bucks on turbo stuff.
Do you want to be able to return the car to stock at some point?
Again easier to do with nitrous, but not impossible with a turbo.
How often are you actually going to use the power?
Certainly not every time you drive it, but this goes into how fast the cost of refilling nitrous bottles will catch up to buying all the turbo stuff.
When you do build an engine how radical are you going to go?
Nitrous is pretty easy to upgrade in sections, a turbo that'll work well on your stock engine (not just the actual turbo, but the piping, intercooler) will likely need a lot of things re-engineered to see its potential on a built engine. This will likely be argued my many people but I'm a perfectionist.
Personally I like both power adders a lot, and can understand why it gets to be a hard decision. I have lots of ideas for both so if you want to sit down and draw up some of what goes through my head we can do that, you might find something you like.