for me, a sunroof was essential. It lets in extra light ona sunny day, and makes the inside feel bigger, also a light leather interior to have the same effect.
satnav wasn't an issue before - but i wouldnt buy one without now.
Multifunction steering wheel - didn't even consider it before, but again, you get used to it very quickly, especially with an ipod link... the next track button is in danger of getting worn out!! Wouldnt buy another one without it.
reversing sensors - couldnt have cared less before, but now, as everything else, i can't live without them. I see people fannying around reversing slowly into spaces that take me 5 seconds to park in now. Not just for the missus!
auto dimming rear view - got one, wouldn't get another one.
heated seats - stops people in short skirts complaining of chapped lips when its cold out.
bose - got it, probably get it again. Not brilliant, but acceptable.
chrome mirrors - purely a taste option.