What would you do with these camera choices?

The Epl 5 is definitely a rather huge improvement from the epl3. If you can afford the epl 5, then by all means go for it. Definitely better than the sony rx100 here other then a slower kit lens. Dont worry about a prime. You can always get one in the future when you are sure you know what is your favourite focal length.

There not much difference between the epl5 and epm 2. Whichever you can get cheaper.