What is the rated sensitivity of the speakers you're using? If expressed in decibel watts (and if my math is correct) the 1050 is conservatively rated at about 15 dbw, or music peaks 15db louder than the 1 watt figure in the speaker sensitivity rating. 200 watts is about 23 decibel watts, or 8 decibels louder. To get significantly louder would require something on the order of 500+ watts, although 8 db is certainly noticable.

If the 1050 is in fact running out of steam, and it's loud enough, or nearly so, then 200 watts may be plenty.