For photo hunting

I'm looking for a semi-pro camera or pro camera that I can use for photo hunt, well, I'm trying to get a new camera to replace my beloved Canon EOS 550D, I intend to get a Nikon D7000 but I have already got some lenses with Canon mount such as EF 75-300mm f/4-5.6 USM , EF 50mm f/1.8 II, EF-S 55-250 f/4-5.6 and the EF-S 18-55mm f/3.5-5.6. so what do you think? and don't mention the flip out screen, I don't intend to use it so much