Another fan of non-drop bars on the road here -- nothing wrong with drops/they make a great deal of sense, esp. re. aerodynamic positioning, but I just don't seem to get on with 'em.

So, fwiw, my take:
1. If you like wide bars (I don't), as in more than, say, 24", then you need substantial back-sweep for natural wrist positioning. Many options out there for this from the mtb world.

2. If you like narrowish bars (well under 24"), which is what I use (Easton flat [non-riser] cut down to 22"), then backsweep not so important; I've found that a minimal sweep flat bar, with Ergon grips and bar ends, works very effectively. The 'control' (brakes/shifters) position of an mtb but with the ability to change hand positions (e.g. mimic 'riding on the hoods' etc.).