I am at the 32" depth.
But will you be installing a toolbox underneath? If so the Harbor Freight boxes and most others are in the 18" range where the higher end models are in the 30" range. The higher end models have done lots of homework and found that is an ideal depth for most work surfaces.
I know this is off subject but it is nice to have an overhanging lip to keep drips or what ever from rolling off and into or onto your toolbox, but too much of a lip will effect drawers. An LED strip light can also aid in vision since the over hang can give shadows.
If you go 30" range and use the 18" tool box there will be lots of wasted space behind the box. Some have utilized very well thought.