i am currently looking for some Mrecedes to add to my collection. here is a list of some i wish to purchase.
i am looking for models that are rare in hope that i can make some money on them when i'm ready to sell. please help me pick a good investment for my money. (the cars marked with a * are ones i think would be a good buy.)

75 300D 182K MILES
*76 280SL
80 240D
80 300D 140K
*80 280CE
*83 300SD 160K
83 280SDL
*84 280SL 96K
*85 190E 2.3 115K (V16??? IM GOING TO CHECK IT OUT)
85 380SE
85 500SEL

im willing to buy two or more if its worth it. your help will be greatly appreciated!
thanks
adam

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Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!)

PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320