What's your budget and what kind of music are you into?
The lowest priced amp that sounds really good with LS50 is Rotel RA10. Best amp I've heard with it so far is the Schiit Ragnarok.
IMO, regarding reviews saying how good it is, you'll need a really expensive amp to maximize it's potential; are you ready to spend more than 2x the cost of the LS50?
Re: LS50 wireless, don't look at Amazon prices. Get it at DCM. They're a lot cheaper. And at the price, it's well worth it, and no need to keep looking for an amp. you have a class D 200w dedicated to the woofer, and a 30w class AB amp for highs.; and this is for each speaker. And you have your streamer built in. Compared to 2 Phantom Silvers, I prefer LS50w; can't touch the bass output of the phantoms but better balanced and detailed IMO.