I just had the chance to borrow an E-420 for a bit and loved it--small and light, which is what sold me on the OM-1, -2, and -4. But I really missed stabilization, so I want to try a 520.
The Micro interest me mightily, too -- no in-body stabilization but it has a movable LCD, a feature I find very useful in my Minolta A1. And I don't mind an EVF in principle--I'm used to that in the A1--but would prefer one with a lot more pixels, which the Panasonic provides.
Lenses I own right now include:
For EOS, Canon 50mm f/1.8, 25-85mm zoom, and a non-Canon 28-300 (Tamron, I think).
For OM: another non-OEM 28-300, plus a Zuiko 24mm/2. 35/2, 50/1.4, and 85/2.
For Leica thread: Canon 50/1.2, Taylor Hobson Cooke 50/2.0, 50mm Hektor (effectively a soft focus due to slight hazing of front element), 50/3.5 Elmar. 35/3.5 Elmar, 50/2.0 Summarit
Bodies: Canon Rebel G and EOS IX, OM-2n & OM-4, Leica III (aka Leica D--~1936)