The 430 I had was two years old and had 15k on it, most of which were probably hard miles too. I'm sure the sound would be massively improved with an aftermarket set up, it was just a massive difference to my decatted setup which, according to my neighbours after it was sold, was "interesting at 9am on a sunday morning" when I was going to football.
The interior was a big let down for me. The crema interior felt like I should be 65 years old of off to lunch to see my friends the Viscount of york. It felt old fashioned to me. The stereo system was dire and the HU looked like a £50 jobby from Halfords. At the end of the day, these are not things that you would buy the car for, but for me, they are things to not buy the car for. Saying that, I've seen some Nero interiors with splash's of Carbon etc, and they look much more up my street.
A 458 would be nice, as would a Macca but sadly they will be out of my price range for a while yet. I really have to limit myself to about £80-£90k before the Mrs starts to pipe up that anymore could be put towards a bigger house etc
I have the guy from the Supercar club coming to see me next week. he tells me that they have a California and a 458 coming very soon, so that could just tip me over the edge