OM-D EM-5 as an every day, all around camera?

Just wanted to say thank you for all the input!! I truly appreciate all the advice.

I would like to add another question since this will be in my use case. One of the things I really need is good zoom range. With the K-5II setup, I was thinking 60-250 or 300mm. I know there are some lenses available for the OM-D that with the crop factor will far surpass 300mm. So my question is, should that be a consideration since I can get an effective zoom out to 600mm for a cheaper price than outfitting a K-5II? Does anyone feel that I would be sacrificing too much image quality in general if relying on the crop factor to get to my maximum distance? I'm not well versed in the crop factor game and whether this is viable solution for getting farther out.