Re: 156 saloon full respray
Prices start about £500. That can be a good job if you do the preparation.
I wouldn't worry about the silver colour match. I inherited a silver car that had been resprayed and it was hard to tell it had been done at all.
If you go black it will scratch back to silver and you'll have to think about the engine bay, the door shuts, inside the bonnet, the inside of the boot etc. etc. making the job much more expensive / time consuming.
I turned a brown car black a few years ago. It had to be done where silver is a good colour IMHO.
"The engine revs like a fat hamsterís heart, releasing its goodness in thick blobs all over the power band, a task made all the more accessible by a gearshift thatís as easy as a Northern *****." Troy Queef 2009