Advice on good amp for mission 774 speakers

First off i would like to apologise because i have posted something similar in the speakers forums, hope you dont mind!

Hey guys the title says it all really! I recently purchsed a set of mission 774 speakers, they have a rated input from 25-125 watts, an impedance of 4 ohms and a sensitivity of 90 dB/W, im looking to spend about 150 on an amp but i dont really know what i should be looking for, i am worried that if i get an underpowered amp i could damage the speakers through clipping.

When determining if an amp would be appropriate what should i look for? If i were to get a second hand rotel amp that had a rated 40 watts per channel how can i tell if that would fall into the catagory of "underpowed"?

I aint going to be playing music exeptionally loudly but it would be nice to be able to turn it up every now and the n :P

p.s. stereo amp only

Thanks in advance guys!

/Mike