New System SimAudio advice please


I currently have a Sugden integrated amplifier Optima 80 (I think it is 25wpc)
pair with Totem Sttaff. I really like the way it sound, but my new house has a 22' x 24' x 12ht living room and I do not feel I have enough power. I would like to replace my integrated ampli with SimAudio I-3.3 or I-7 with possibly new totem speaker, Sonus Faber or B&W 800 series. Anyone has any advice?