It's almost impossible without trying them to figure out which of these might be the easiest/most comfortable to use, though I'm now more intrigued by the nano- Stealth. I suspect that in most situation's I'll have my left hand on the lens for focusing, and putting the right hand on the camera seems natural both for steadying the camera as well as having it ready to adjust aperture and shutter on the fly...so maybe a handle-grip isn't necessary.
Your mileage my vary...
nano RunningMan (notice the handle!)
Redrock: nano DSLR rugs