You're not going hurt your speakers with a more powerful amp. If your speakers are under strain from too much power/volume, its very easy to hear, and all you need to do is lower the volume. Its much easier to do damage if you under power them. Not only that, no 2 companies measure power the same way. One brands 50 watts may be another
's 100 watts, or even 20 watts. It all depends on how they measure.
An integrated amp you may want to consider is an Ayre CX-7. It's sound is difficult to describe because it doesn't really sound like anything else, tube or SS. If you find one to demo, I think it would be well worth your time.
Other posters recommended Pass. That's also a good choice. The only thing I would add, is to not overlook the Aleph series. Even though they're older, they still sound great. A 3, 5, or a 0s would be a good match.
A BAT 300ix and a VAC Avatar would be worth looking at, as well.