I'm personally a big fan of "Wink" mirrors. These are the wide angle, multi-faced mirrors that will give you 180 degrees of coverage. They attach to the area above the windshield glass and are available at most auto stores. If you drive in heavy traffic, they are invaluable, though admitedly a bit ugly.

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'76 240D-Sold
'78 240D-Sold
'85 300 SD, 165K-Sold
'88 300 TE, 165K-Sold
'64 Porsche 356C Cabriolet- under restoration
'86 560SL 124K Miles-Sold
'94 320E Wagon, 74K Miles-128K Miles JUNKED
'06 E350 Wagon, 84K Miles
07 SL550, 14K Miles