Match of amp power and speaker power handling

I am still pretty new to the high end audio world so my question is probably pretty basic. I am very confused about how much power I should look for in an amp (I'm talking separates, not a receiver) to best/appropriately drive my speakers. I have B&W 604's Series 3 that are rated (conservatively according to B&W and the dealer I purchased them from) at "25-200 Watts into 8 ohm on unclipped programme". My initial impression was to purchase an amp that is rated at no more than 200 watts. I have since read from numerous sources that one should actually have a higher power rated amp than the "maximum" rated power rating of the speakers in order to provide enough "headroom" power to accomidate the very short duration spikes in power requirements that music demands. I have read once should have an amp that delivers at least 150% the "maximum" power rating of the speakers and that most speakers are damaged from running an underpowered amp into clipping rather than to much power. I understand this concept but how do I know what is too much power putting my speakers at risk. Thanks for any infor anyone can provide.