These days at the gym I'm really into techno and techno/rock and stuff like that -- try searching for these songs:

Thomas Falke "Revolution On The Dance Floor"
Groove Cutter "My Shooter"
Control One "Just A Little Bit"
Ian Carey "Redlight"
Kevin Weg "Dead Radio"

I don't usually go for techno but these are sort of like a wierd crossover between rock and techno/trance.

Most of these I found at this itunes page -- http://www.electricfilebox.com/tracks