I have my E10 on low gain and the volume at 5, so I think it is a good match for the MA900.

I picked mine up for $185 with free shipping from the Amazon Marketplace.

My MA900s just came, and while I need to spend some time with them to give a verdict on the sound, I didn't need a minute to decide these are the most comfortable headphones I have ever tried. They simply vanish immediately with almost no clamping force. The bass seems to be pretty good, even...

I got my M80s for $130 when Radio Shack was closing them out, but I would have gladly paid $170 or more for them. If you are sure that they will be comfortable, then go for it, they sound great.