I believe the stock ej20 rails will be okay, but not sure about that.
you'll probably need injectors (sti pinks) and an intank pump (walbro), and an engine management system (cobb ap, txs utec, etc... not sure what you mean by 'minor tuning') to swap a turbo. if you don't want to go that far, just mod other things, like your drivetrain, exterior, interior, audio or suspension. or put the money into something else entirely.
About the fmic, there are plenty of tmics if you can invest in that will fit without having to mod anything. i think helix has a new tmic that people seem to be relatively happy with, and it's affordable also (~$600). But I think the stock intercooler is pretty efficient with the stock turbo.
ps- how's the helix up/dp treatin ya? I'm lookin at buying the two and a helix catback for my new rex in the next couple of weeks..