from what i understand if u get a remap you'll need to buy an emulator if you want to start modifying your maps realtime. you can also buy a cheap eeprom writer but you cannot do realtime and each eeprom can only be burned once. both require one of those piggyback sockets to be installed (which would be done if you had a remap) - either way it starts to get fiddly and expensive if you dont know what your doing.
the nistune board pretty much does the exact same thing as all of the above but is much more user friendly i.e. you can plug your p.c. in it and tune it realtime, look at sensors etc. and know its going to work. the added bonus is that theres software/revisions specifically written for it.
so for the extra cash you'll be able to do your own tunes later on quite easily
if you want real cheap, install a piggyback socket thing, get a jaycar eeprom writer kit and find someone on the net whos uploaded a rom file to suit your specific setup, write to a blank eeprom, install and driveaway. Or copy a mates map with a reader/writer kit etc.
correct me if im wrong