the bryston would probably be a good match for the M80s.... However, why the heck would you use 5k to drive 1.5k?!!!!

If you have a real budget start over. You can do way better speakers and amp wise for 5k from scratch. Just saying.....

Demo gear. You will be surprised.

If you are really into your M80s, set a budget of 2k or less. You can get some outstanding integrated amps for that.