The Pioneer DVR models with HDD were never released in the US. However, they were sold in Canada which uses our NTSC system. They have model numbers like 450h, 550h and 460h-660h. European PAL units had an S at the end of the model number.
These Pioneer DVRs have excellent comb filters, better than a HLD-X9 with more adjustments. They are probably not as good as the Crystalio II which used a TI 5 line comb filter.
As far as the S9 vs X9, the X9 has less inherent video noise and uses a better laser which eliminates the color smearing seen on the non MUSE Hi-Vision units.