If I was to invest in a set of tools for common DIY repairs, what range of sockets, wrenches, hex heads, etc. would be recommended to cover most of the car? Most of the sets I'm looking at include 1/4" 3/8" and 1/2" drive sets with certain sizes missing - some include deep sockets, etc. Any suggestions?

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2003 S500 Black/Charcoal
1990 560SEL 61k Arctic White/Grey

SOLD:
1988 420SEL Black/Palomino Sold @ 85k
1987 420SEL Midnight Blue/Grey
1986 420SEL Diamond Blue/Grey
1983 380SEL Champagne/Palomino