Phoenix Yellow really is an acquired taste but it is a real classic now and 100% original examples like mine are coming back into demand now. They;ve also done the new M4 in PY! Plus mine had 38k miles with a single owner from brand new and FSH from the same BMW dealer since new so I couldn't say no - it was stunning inside and out
As said above, Estoril Blue is stunning. There are a few individual colours too, some of them are very nice.
Inspection II service is about £900 from a main dealer but it is pretty comprehensive. A set of discs, pads and sensors all around is £675 from the main dealer and a job which can be done at home.
Subframes are weak on M3's so have it checked at a main dealer. Luckily mine was given the all clear.
If you want any advice please let me know. Mine is an SMGII - it is a fab driving experience
Cheers
Bill