There are so many compact system cameras available now it's hard to keep track!
I'd live to be able to help more but I've not used one ...
I think to a point they are a much for muchness the m4/3rds cameras
The pannys have touch screens, the olys don't ...
They all seem to take decent photos, pretty much SLR quality ...
My advice is always the same, go down you local independant stockist and try a few in the hand!
Take a memory card with you and take some photos in raw (if you shoot raw?) at various isos and see what you think!
But really, I doubt you can go far wrong!
Have a look at DPR, they recently did a CSC round up for the year...
Just bare in mind, with CES jan 10th we could be expecting some new releases very soon that might bring down prices of current models and will be on the shelves by end of march!