how much you got to spend 1st cos that's the biggest killer
as for NA
you could do a similar thing to what I've done (read spec below) for about £1500-£2000 IMO, I got a load of 2nd hand parts of off zee to help me on the way so I was lucky
then there's throttle bodies, there's a thread on this in the Tezza forum just have a look (topic started by myself ) may help make up your mind
as for FI be prepared to get you wedge out as once you do one thing you will then need to do another
not sure how much power the clutch can take before slipping but that is something you will need to do for any major tuning,
also
you will need a new ecu to run the set up,
injectors up grade'
up rated internals,
cams and pulls
the list is endless
again , how much money do you have to spend????????????????????????