Subtantial improvement over Emotiva XPA-1's?

I'm considering upgrading my amps, Emotiva XPA-1's. My options at the moment are: Clayton M300, Theta Citadel and maybe Mcintosh MC601. My speakers, Tyler Acoustics D1.
Do you think is it worth the extra money? Is there going to be a HUGE improvement in sound?
Thanks for your help.
Leo.