I recently heard a system using an oppo3 as their preamp and a simple marantz integrated amp with a pair of bookshelfs {quad 12L2's} and it was impressive, I am now an oppo believer, I like that setup... I like as direct a path as possible for music, I don't like an avr, and some people do or don't mind it, I want it direct and simple and the oppo seems to do that better than most other equipment available...
As far as your L7's that is totally up to you, grab another pair of speakers in your price range and compare them... But personally if you are looking to build a music only system, keep it as direct as possible and get speakers you like...
as for wireless or wired, I like wired, but my borther steams from his phone all the time and it sounds good too... A lot of people get hung up on what you can't hear {kind of like me and not using avrs for music, lol}...