good technique to generate a random delay?

I have a sequence sending in commands to my DUT.  Following each command, I would like to wait for a random delay.

Two possible techniques:

1) Use a virtual interface to my system interface; pass a random number to a wait_clk method, which in turn uses a clocking-block.

uint32_t delay;
delay=$urandom_range(0,1000);
vif.wait_clk(delay);

2) Perhaps 1 is overkill ( requires a virtual IF, which adds a dependency, perhaps less re-usable).  Perhaps something more like...

  uint32_t delay;
  delay=$urandom_range(0,1000); 
  //#delay ns; // not correct syntax!

3) pull in the configuration of the agent, using m_sequencer, and use it's methods... maybe this is the most appropriate. 

  virtual task body();

      if( !uvm_config_db #( plb_agent_configuration )::get( m_sequencer, "", "AGENT_CONFIG", cfg ))
        `uvm_fatal(report_id, "cannot find resource plb config" )

      // issue command left out

        begin
          uint32_t num;
          num=$urandom_range(1000,0);
          cfg.wait_clk(num);
        end
      end

    endtask

Share with me your favorite technique