Personally, if I were to run a dwarf car, I would buy the adjustable style coil overs that can be found all over the place. I'm pretty sure leading performance shock companies like QA1 AFCO and KONI have adjustable coil overs that wouldn't cost much more than the Bilsteins run on the INEX legal cars. The advantage would be the ability to adjust compression and rebound rates to suit the car, track, and track conditions instead of buying multiple non-adjustable shocks.
Of course an argument could be made that adjustable shocked coil overs are more expensive as well as having a steeper learning curve for people not involved w/ adjustable shocks on a regular basis.
Just my 2 cents worth.