As others have said, don't go spending it all at once. Remember, it's your first car and nothing else. Wait till you're off your p's and purchase the car that you want without the worries of cop attention and insurance. I've had my VR for a year and a half now, p plater, 3.8 V6 auto, driven 40,000 km in it and the only things i have had to replace was a set of coil leads, and a harmonic balancer. Not to mention they are cheap to run and suprisingly reliable. Best $2,500 i've ever spent 
p.s. this is a car with 255,000 km on the clock
My car audio:
CD tuner: Alpine CDA-9884E with Ipod interface
Front speakers: Alpine Type R SPR-17S 6.5 component speakers, powered by a avant-garde 23dxi 2 channel amplifier - 2x51 watt RMS
Rear speakers: pioneer coaxials connected to tuner
Subwoofer: Alpine Type R SWR-1222D 12" 2 ohm dual voice coil 500 watts RMS powered by a response precision 2x150 watts RMS 2 channel amp bridged to 500 watts RMS @ 4 ohms