OM-D Newbie, walk around lens kit

Hi,

Just ordered a new OM-D, excited
Its a second camera system for me when I need fast AF, zoom and more subtle shooting in low light street. Occasionally building photography will be required at close quarters.

I want (i) a bright high quality walk-around lens (30-50mm FF equiv), (ii) moderate zoom, (iii) high quality wide, but bright not needed, (iv) portrait lens, but getting 45mm free from Olympus so this should cover it

(i) Bright high quality walk-about. It seems that the main candidates here are the panasonic 20mm f1.7,  panasonic Leica 25mm f1.4 and the Olympus 17mm f1.8. The 17mm is new and there don't seem to be many reviews, but if its sharp it might be the best compromise. I used the Panny 25mm before and its excellent but prefer a bit wider. Lastly the 20mm is supposed to be really sharp but an older design lens which does not autofocus that fast ? (just what I have heard, please correct if wrong)

(ii) Getting 12-50mm with camera. This zoom is ok but not outstanding as I understand. Obviously the new panasonic f2.8 zoom looks great but you are paying for OIS which is not necessary. What have folk found out in terms of 3rd party zooms and travel zooms, in terms of good centre sharpness throughout the range ?

(iii) High quality wide seems to be either the Oly 12mm, Oly 9-18mm or the panasonic 7-14mm.

(iv) keep the 45mm for now.

I'd be interested in comments in any section above on differences in terms of handling, focus speed and sharpness. Also if there is any disadvantage of a Panny lens on an Oly camera (apart from the OIS)

many thanks in advance