I can't seeing myself buying a White PSVita. I've had a silver PSP 2000 and I really liked it. I've got a Piano Black PSP now and I'm quite pleased with it. If there is a Silver PSVita then I shall gladly pick it up.
I have the Star Wars Battlefront 2 white PSP-2001 (the one with the Darth Vader mask on hte back) for 4 years. It has been mishandled, dropped scratched and abused, but it still retains its white colour. Other than stans from where the chassis was scratched, its still looking good.