I've been running about 12.5" front and back (with stock sways/endlinks) for the last 3 years. I haven't noticed any ill effects from the combo, and the height is fine for 99.8% of my driving. Sure, my front lip isn't the prettiest thing, but I've only dragged bottom twice while off-roading. Once in New Mexico going up the dirt road to my cousin's house, and once trying to find my way back to Junction, TX from a family reunion. No problem with speed humps or anything like that.
I'm sure others will chime in on sways, but it seems like the RB hollow front bar (with the stock rear bar) is popular around these parts.