http://www.betalounge.com/ has some great techo sets, have a look for the kevin saunderson, jeff mills sets, recloose, juan atkins sets, there are lots of other good ones (real player unfortunately).
http://www.bbc.co.uk/radio1/dance/
http://www.grooveradio.com/
Technically speaking "techno" is quite minimal stuff, if you want oonst oonst you might want hard house or club trance style stuff.