What to replace before the 100+ mile commute ?

[RobPatt]

Getting ready for my 100+ mile commute daily w/the black beauty E34.
She's got 175K miles, but months ago the board, and my daily driving pleasure, convinced me to keep her well into 200K miles.

Fuel pump? My fuel pump is 5 years new... but buzzes loudly... on its way out or not ?

Radiator and exp tank - no problems ever... replace the radiator AND the expansion tank... or just the tank.. ?

All hoses go without saying.. .will do 1 part ordering on that from BMP design.

Alternator ? thoughts? only lights that flicker are my OBC...dim/bright/dim/bright

Volt Regulator ? thoughts? again, no issues.

I'm very PRO preventative maintenance... but not for burning $$$.

Much appreciated.
Cheers,
Rob.

(she got new belts, tires, brakes...compressor, evap, h20 pump, t-stat, pulleys, tensioner...alu t-stat housing...coils....... thanks much!)