yeah RoadRacerX and RoadracingWorld are the only mags I subscribe to. Somebody sent me a link to Sport Rider not long ago for $3.99/year but I really didn't think that magazine was quite worth $4 a year...
Used to read Superbikes as well but its too expensive to read regularly, though definitely a good magazine (disappointed to hear about not having centerfolds anymore, that was a nice perk!)