Marquis has good suggestions. Write down and rank your criteria, then you can even post here if you want to and people will have a better idea as to how to help you. And I agree, if all else fails, get plasteredand throwdarts.
My (brief) take on the three:
The CL56 is slightly more powerful (128MB M11), but not quite as portable as the M6Ne (slightly biger/less batt life, but still has 4.5+ hours). The Aopen has had some problems associated with it and at the time of my purchase (a month ago) some of them had yet to be resolved, which took it out of the running for me (plus I didn't really like the way it looked.
). Speaking of looks, I think the M6Ne is slightly more stylish, but the CL56 looks more professional. And yes, the CL56 looks much better in person than in the pictures.
My expierience with the CL56:
It handles anything I throw at it with ease. Far Cry and Planetside (the two most intensive games I have curently) run like a dream and look AMAZING.
It also has great thermals, only ever gets hot in one place (right above the home/end keys) and cools down very quickly. And is amazingly quiet. Also blows the nuts off of all of my friend's desktops!
But you really can't go wrong with any of them. They're all awesome machines and are very similar. Have fun playing darts!!!