I have used the Acoustic Energy Internet Radio for just over a year now since accepting recommendation made on this site, and love it. With a small physical footprint, slick user interface, and aesthetics that match the Denon MD-31 mini system it's plugged in to (requires 3.5mm stereo jack to dual RCA lead), it's proven perfect.
Ours is streaming Czech radio stations nearly all day and we never notice any impact on broadband or wireless connections; when not abroad, I work from home and would quickly notice any significant service degradation.
£169 from John Lewis.
Now £159 I recall.