106 comes with the rear torsion bar, IIRC. I had a gmax spring/strut set up on my old 206. It depends what you want it for. Don't expect out of this world handeling, but it will be improved slightly. If you going to track it, buy something slightly higher quality and realiable like, a set of billies' or Gaz's. If you want it for looks, then it will more than likely do the job fine. Though mine were very hard, and stiff. but did what i wanted them to do.
How low you going by the way...
and as with anything...You get what you pay for i geuss.