I just put a pair of Rubicon 250's on my 07 SAN. I think they sound excellent. Much better than the stock Defcon III's and $600 cheaper. I'm powering them with a Clarion APX480M that is putting 230 watts RMS x 2. They are rated at 250 watts RMS. If the volume is cranked up past 20 I can hear them pretty good at 70'.
might look these guys up.. they have been coming up in the scene and are looking for more riders. we put some on our vtx (profile) and they are clean and loud! http://dbot5.com/