Audiovector R3 Arrete or R6 Avantgarde in 4×4.2m room

I have a Gryphon Diablo 300 and 2 Rel 812 subs. And looking for new speakers but i cant decide between R3 Arretè or R6 Avantgarde. And its to far away to a dealer so i need to buy them unheard. I know that R6 have better bass but i think my sub can match that, but how is the midrange and top on top of the line R3 compare to middle version of the R6.

The room is 4×4.2 meter and 2.6m high.