My two favorite authors are Alan Jacobson and Austin Camacho. Both do excellent Washington DC based crime and mystery. Jacobson's most popular character is FBI profiler, Karen Vail and Camacho's is "troubleshooter" Hannibal Jones. Vail is smart, sarcastic and tough; she's had here share of one on ones with serial killers. Hannibal is physical, smooth and sexy and always looking out for average folks.
Okay and yes, I've read all their stuff, but I'd gladly read them all again!