Having a grip is great, but you can always try to learna new position to hold your camera instead. When I shoot portrait, I hold the camera somewhat similar to the vertical position cjtune posted. I hold my lens with my left arm, and I grab my camera with my middle and index finger on the grip, with my thumb on the shutter release button.

btw, if u shoot a little with the "winged" position already screaming about pain, you wouldnt wanna buy those pro tele lenses that weight 1.4kg +/-.

lol, you just wanted a reason to get a new camera didn't you? I believe my lens itself is already heavier than your camera + lens + flash.