Everyone's opinion for rear end to go with?

So I recently created a thread asking if anyone had made a full floater Dana 60 that had a 5x4.5 bolt pattern and I got to talking with several members about which rear end to use in my long bed 83 D150. The plan is told build a 600 horsepower W9 headed 360 that turns around 7,000-7,500 rpm with a Brewers-built A833 and a clutch tamer to help the trans hold up as per the recommendation of Dan Brewer. Long ago my plan for the rear axle was to run an 8 3/4 for easier gear changes but a few members were worried that the 8 3/4 wouldn't hold up with the pickup's weight, that level of power and the 4-speed. So I'm going to poll it out to see what everyone thinks I should do. Go 8 3/4 for easier gear swaps but not as much strength or Dana 60 and forfeit easy gear swaps for guaranteed strength?

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What's your plans for suspension? Ladder bars, 4 link or some sort of caltrac?