In a nutshell - technically its much safer to overpower speakers than it is underpower them. I won't go into specifics but you can search this forum on underpowering/overpowering speakers/amps, you'll find heaps of info and some interesting and informative insights from Bob Detrich - well worth the effort.
As an example I run 2 passive APX152s (~300watts) off a V4000 which can deliver 600 watts per channel without any problems. Sometimes I turn the gains on the amp down a fraction depending on the size of the room.
Despite this always listen to your speakers with your own ears, too much power can sound distorted especially with lower frequencies. Good luck.
ROQ out.