Looking for powered bookshelf/monitor speakers $1000 or less, used is ok. Any recs?


Any specific listings I should look at?  This is for a frugal friend who wants a portable high-end system.
Thanks!
redwoodaudio
Thanks guys!  I sent my friend info about the klipsch and also KEF LS50w (the latter a little out of his budget).  Keep any other suggestions coming.  I'm realizing that built-in DAC will be very helpful -- friend isn't too keen on having to buy other components.