Thats not the half of your problems..
Olympus OM-D E-M5 Review: Digital Photography Review
is a very good and reliable source of information.
The OMD E-M5 is a game changing camera, but bear in mind that you need to put the budget into the lenses to realise all of it's benefits.
Absolute requisite lenses:
Olympus 9-18mm (Panasonic 7-14 is better, but too wide to be an every day lens
Panasonic 20mm f1.7
Olympus 45mm f1.8
On the 14-40odd mm Zoom lens front, unless you are getting the 2.8 zooms get a Panasonic one but not the little pancake, its cute and all, but...
The Olympus cheap zoom's in the 14-45odd mm range are not really worth considering.
Four Thirds | Micro Four Thirds | Products(Lenses)
The Panasonic 14mm f2.5 is worth buying just to have as its rather good and ludicrously small, but the Olympus 12mm f2 is much better.
there is also a Samyang 7.5mm fisheye, which is rather good, if a little impractical, and not everyones cup of tea
its a bit of a trap, deciding which of the lenses to buy, and jumping about between Panasonic and Olympus.
Oh and if you're into video, rather go for the Panasonic GH3, or 4 if the budget takes you that far.