Double Din Car Computer New Car Stereo, Or Video Card For My Computer?

New car stereo, or video card for my computer? - double din car computer

What should I do for my birthday? I can choose two of these three: car radios, speakers for my car, or the graphics card for my computer. The graphics card is a Raedon 4870, is a Pioneer Stereo Double-DIN DVD player, and I'm not sure what is still speaker.