Hi SPOONU,
The remote central locking for the 318is has just arrived. While I'm at it, I will add a gizmo not listed above. I will add a central locking button to the dash (I will follow
this tutorial, which, sadly, is not available anymore on its
original website). I have a spare non illuminated window switch to do this.
Almost forgot, I will go for an M Tech 2 steering wheel, I do prefer it upon the M Tech 1.
Considering the E21, I will mount these by the end of the year:

These are BBS RA 7×15 inches, 13 offset. I will install lowering springs and Bilstein shocks. I will try to retrofit remote central locking as well, but this is not a priority.
The M3 will receive a full OBC and cruise control (it should have had a cruise control, it's a must have IMHO).