What do you think of the Biostar TA 790GX XE mATX? With your other components, I don't see why you can't fit everything into a shoebox case, without making things too hot.
You need to be more specific about your objectives though. Are you planning to overclock? Upgrading to more powerful components within a certain period?
Well, I already have Asus M2N-XE but I think that this motherboard isn't good... What do you think about it?