it might be a bit counter intuitive, but if for whatever reason you can't match your amp and speakers perfectly, it's better to have a higher powered amp into less capable speakers than a less powerful amp into more capable speakers.

the reason is that with good speakers and a crappy amp, it's too easy to turn the amp way up. if you start clipping the amp, you can still destroy the speakers even at a power rating they are supposed to be able to handle.

if you have a strong amp into weaker speakers, you can give them a nice clean signal all the way up to what they can handle.

that being said, it's still best to match them if you can. amp makers will use confusing language when they provide their power rating (to give the most favourable description), so be careful to check whether they are talking watts per channel, or in bridged mono, etc, and at what resistance (ohms). generally speaking, lower resistance means louder, but also more noise, and higher resistance speakers are quieter, but tighter.