Pro Vibe 7s Round is pretty much exactly what you are asking for I believe. I thought that was the what I wanted until I actually got one in my hands. The transition from the top horizontal part of the bar is pretty much flat with the hoods.

What I really want is a bar that is relatively short and shallow with a classic round bend, but that also has a bit of dip between the horizontal flats and the hoods of the shifters. Something like in the picture I have linked to below. Any suggestions? Maybe the current Ritchey WCS Classic or Deda Newton Shallow?

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SLX3 is not at all similar- it is more like a compact bar.
It is much shorter reach than Zipp (75mm for Easton).
It does have a nice and flat transition though.
The newest Version of the Zipp bars comes in 3 reaches- the 80mm reach might be just what you are seeking.