I've been running the General Grabber UHP on the same staggered 19" setup as OP for about 20,000 miles. No problems or complaints, and treadwear seems decent. I also live a warm climate so I run "summer" performance tires year round. An added bonus is the fact that the tread pattern on the General UHP looks bitchin. They really attract attention to the beefy 285 rear tires. Since putting on the Generals I've had a few people comment on how wide the rear tires appear.

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Now:
E53 4.4i Sport
E39 /// M5
back then:
E36
E30 (x2)
E21