Best drop for a daily driven 'Burb?

[laplander]

I'm getting ready to start ordering parts for my '72 Suburban and need some real world advice on a drop. Is the 4/6 too much to be driven every day, or is a 3.5/5 a better option? The roads out here aren't the greatest and am concerned about that and the speed bumps. I'd like to avoid C-notching the back if at all possible too. Does anyone have any pics of theirs and or any special things I need to think about before doing it? Thanks.