Haha yeah, no vehicle restrictions over here yet, and I have a reliable source that tells me it's not even on the cards yet. Although in a few months, P-platers will only have 4 points to play with, so keep that in mind lol.
Edit: Silvias are a very good first car IMO, being light and well balanced is ideal to learn with. Just don't go nuts on getting more power from it, because an SR20DET version will need better suspension & brakes well before you run out of power, and an SR20DE wont respond well enough to mods to make it worth doing.