Yes, you can copy your CDs and get better sound quality, if you can afford Linn DS, Naim HDX and the like. Certainly you can equal CD.
A thread like this:-
http://www.whathifi.com/forum/computer-based-music/mp3-320-kbps-vs-flacwav
might be good reading to get a feel for the divergent views on formats beyond physical media.
Wireless speakers are rarer, but I've seen good comments on Audio Pro, though there are doubtless others. For wireless systems, which include speakers, Sonos are the mainstream leaders - look at Play:5 or Play:3, which include amps.