Cut two pounds of boneless beef top sirloin steak into thick chunks and place in a large bowl. Combine olive oil, chili powder, salt, paprika, onion powder, garlic powder, cayenne pepper and cumin into a small bowl. Pour spice mixture over steak in large bowl and massage into meat. Allow meat to marinate for 5 minutes. Cut red, green and yellow peppers into large chunks. Skew meat and peppers onto skewer by alternating between meat and peppers. Cook over high medium-high heat until meat is cooked to medium well. Serve with salsa, lime wedges, tortillas and rice.