For your room, given your equipment and MY taste*, go for the ATC 150 ACTIVE or you’ll be spending unnecessary time & money trying to drive them properly. The Agoria are excellent speakers but the ATCs will give you the excitement of classical, the immediacy of rock, and the beat (?) of techno, in one package. The 300s are too big for your room, I think.
*obviously: it's objective only to the extent of my own preferences!:)
*obviously: it's objective only to the extent of my own preferences!:)