If you are interested in the em1.2, HDEW have it in ( new) at 599 quid at the moment - they are grey imports but have a 3 year uk based warranty - I bought a lot from them some years ago when they sold nikon.
Almost impossible to suggest a milc: just so much depends on what you to photo but it is a compact system with good picture quality unless you really have to push iso to v high values.
I have a em5.1 which I got about 7? years ago and it has had hard use. The thing I like about m43 is the huge range of glass - mostly v good - at all prices ( used ) and all sizes from the diminutive oly 1.8 primes to the hefty pro glass.
The lenses I use(d) most are the two pan kit lenses: 12-42 ( not used much now ) and 45-150 together with oly 25 and 45 1.8 primes, the 60 macro, 9-18, and a pan 100-300. I also have the oly pro 2.8 12-40 and that is the one I tend to leave on the body.
I also have a fairly full Nikon 1 system which is even more compact and has the cx 70-300. It is that which tends to get shoved into cabin bags on easyjet. This system is not recommended for the fainthearted - you are always fighting noise with the 1 inch sensor - far more than with m43.