geneevans Welcome, I think you would be very pleased if you upgraded to the M60's or the M80's, the 60's and the 80's are very similar sounding.
The subject is arguable if you would notice any difference in sound quality by upgrading your receiver, I did when I upgraded mine, it may have been percieved but I was happy nonetheless. The 2807 is a great receiver, and if you went with the m80's you would have no poblem driving them.

A computer once beat me at chess, but it was no match for me at kick boxing.