In general, you want to locate streams with wider bandwidth. 128K MP3 is the absolute least I'll subject myself to unless the source material (e.g. 1940's swing/big band) doesn't require more fidelity. 192K MP3 is much preferred to 128K MP3 but is not easy to find, particularly for free. 128K AAC (or AAC+) sound about the same as 192K MP3. Certain classical stations in EU stream at 256K. Here are some stations you might enjoy (assuming Agon's site will allow these links)..
KAMU FM, 192K MP3: http://128.194.247.73:8000
StreamingSoundtracks.com, 128K AAC: http://209.9.229.205:80
Sky.fm and DI.fm. Dozens of themed streams. MP3 and AAC+ streams. Free at 96K, Paid at 192K. Mostly DJ-free.
RadioParadise.com - 128K AAC and 192K MP3, both for free! Listener-supported. Minimal DJ, no ads.
KANM Student Radio - 192K MP3, http://kanm5.tamu.edu:4040/
AVRO Klassiek 256K, http://145.58.33.31:8072
MR3 Classical - 256K, http://212.92.28.75:2006
Concertzender 192K, http://145.58.33.31:8114
Swiss Internet Radio - RadioCrazy Jazz - 128K, http://82.197.167.138:80
Smooth Jazz Expressions - 160K, http://64.92.199.69:8216
Kink FM Alternative-160K, http://81.173.3.20:80
La Grosse Radio | Rock & Alternative-192K, http://91.121.117.102:8192
Classics Remember Oldies-192K, http://88.191.51.234:8000
HifiHits.com Rock-192K, http://74.52.20.63:8000
RadioNonsense.com Rock-192K, http://209.51.162.170:9378
Deeper Into Music - 128K MP3, http://stations.loudcity.com/299/listen.pls
NetworkStudioFive - 192K, http://89.238.146.154:7000