A lot of people don't need more than 50-70 W for the loud peaks, but you said you like it loud and sit 15 ft from TV, so you might need a lot more watts. Get the 200 W Monolith if you want to make a difference, and the 3500 to last..
Even with the amp, you will only gain 3 to 4 dB of headroom so don't crank it much higher than ref level.