I'll try getting a quote for a locksmith to make me a new set of keys

Just buy this and do it yourself

http://cgi.ebay.com.au/IGNITION-FRONT-DOOR-LOCKS-FITS-VARIOUS-DATSUN-NISSAN_W0QQitemZ250312944506QQcmdZViewItem?hash=item250312944506&_trkparms=39%3A1%7C66%3A2%7C65%3A1%7C240%3A1318&_trksid=p3286.c0.m14

I have broken into my coupe a couple of times with a coathanger or bit of hooked wire slipped in between the windows and worked in until it hooked directly over the lock switch. pretty easy, made me worry about security.

I keep a AAA card in my wallet.

With the plus plan, they'll come out open the door, and make you new keys.

Don't get much easier than that.