Yes, Panasonic would be fine. Recommended amp power for speakers is a bunch of bs. You could hook those speakers up at a 1,000 watt amp without a problem, as long as you don't turn the volume knob up all the way (and if you did, you'd probably blow out both your speakers and your ears!). In real life, the greater risk to speakers is playing a lower power amp too loud, because it's amplifier clipping from being driven too hard that is the main cause of speakers blowing out. The risk is having too little power, not too much. Also, the panny is rated at 100 watts into 6 ohms - it's like 75 watts into 8 ohms. Anyway, the ratings are irrelevant, the Panny will work great with those speakers. Pretty much ANY amp will be fine with those speakers, from the t-amp up.
You're going to get a lot of debate about the relative benefits and downsides of class D and Class A-B. They definately sound different. The Panny using digital inputs is much quieter and more detailed than those AB integrateds, with better bass control. The T-amp is warmer than the Panny, but clearer than the ABs. I prefer the sound of the t-amp, but the convenience and control of the Panny. Personally, I wouldn't buy a class AB integrated today for use with modern bookshelf speakers. I have a marantz receiver, which is highly regarded, and the t-amp amplifier through the RCA outs of the receiver sounds far far better than the built in amplifier, imo.
One cavaet: I really don't like the sound of the panny with my old B&W 801 series 80 speakers. The amp is powerful enough for those very inefficient speakers, but it sounds cold. I think it may be an impedance mismatch, as those old 801s did not have a very stable impedance. But with modern bookshelf speakers, I've been really happy with the sound of the Panny. It's quite good.
I have not heard the Ushers, but I have heard good things about them. Some reviews say you should have a sub because the woofer will bottom out easily. It's also a bit more expensive at $400 than the other bookshelves mentioned. On the cheap end, the Infinity P152s are a great deal right now at about $100 pair shipped, or less if you go through the factory auctions on ebay. They are comparable to the Atoms.
I hope that's not too much information.