Well, the additional power means those music peaks won't be clipped. For example, if your speakers are pulling 20W and a 10:1 peak comes along, a 200W amp can handle it nicely and probably a bigger peak than that. A 100W amplifier will clip that peak since you only have a 5:1 headroom.
If you are biamping or even triamping, then each amplifier doesn't have to be as large since that peak is not divided up between a number of amplifiers.
However, more power is better up to a point. A while back I was consulting for a high end audio company and working on developing a 100W and a 200W power amp. What I found was given the semiconductor devices available today for a Class AB amplifier, there is a sweet spot for 70 to 125 W/ch amplifiers. Above the 125 W/ch level, cost begins to increase significantly to maintain sound quality, high current capability, and power reserve.
If you are really only using 1W of power, I'd look at a good SET amplifier! If you are not into tubes and prefer solid state, any good audiophile quality amplifier in the 70 to 125W range is worthy of a good listen. At least you have options for other speakers at higher power levels, whereas the SET locks you into very low power applications.
That being said, I don't see a problem using a 200W/ch amp and I personally would look for one with very high bias since you are using it at low levels. That is, Class A operation up to 15 to 20 Watts then Class AB beyond that. I've seen ads where this concept is called "heavy Class AB bias". There is no point in brute forcing it when you can do it with finesse. :-)
If you are biamping or even triamping, then each amplifier doesn't have to be as large since that peak is not divided up between a number of amplifiers.
However, more power is better up to a point. A while back I was consulting for a high end audio company and working on developing a 100W and a 200W power amp. What I found was given the semiconductor devices available today for a Class AB amplifier, there is a sweet spot for 70 to 125 W/ch amplifiers. Above the 125 W/ch level, cost begins to increase significantly to maintain sound quality, high current capability, and power reserve.
If you are really only using 1W of power, I'd look at a good SET amplifier! If you are not into tubes and prefer solid state, any good audiophile quality amplifier in the 70 to 125W range is worthy of a good listen. At least you have options for other speakers at higher power levels, whereas the SET locks you into very low power applications.
That being said, I don't see a problem using a 200W/ch amp and I personally would look for one with very high bias since you are using it at low levels. That is, Class A operation up to 15 to 20 Watts then Class AB beyond that. I've seen ads where this concept is called "heavy Class AB bias". There is no point in brute forcing it when you can do it with finesse. :-)