Ash, that is really gonna cost you my friend.
I am a real Merc fan and still have two including W140 S320 (originally cost £72k)
Apart from the fact they cost an arm and a leg the maintenance is cruel.
A set of wipers for my S320 is £98
Why not consider something like Mazda MX5. Nice, reliable, cheap, and so pretty. The 1.8 goes like .........
I had a special edition with leather interior and walnut trim. By gosh it hugged that road and was quick.