If your amp can handle a speaker impedance which drops down to 1.6 ohms at 20kHz (I don't know if the s300iu can or not), you might also want to consider the Martin-Logan Source, at around $2200 new. I haven't heard it, but reviews have been very positive, and I would expect it to offer better transparency (both literally and figuratively!) than most speakers in its price range.
http://www.us.martinlogan.com/speaker_intro/source.html
Regards,
-- Al
http://www.us.martinlogan.com/speaker_intro/source.html
Regards,
-- Al