Yes, the SS is far superior to the PPG Intercept. Not only from a standpoint of conductivity but it will also maintain the seal much longer and retain the insulating gas. The spacer and its seal is also a key factor for the soft-coat Low-e as any infiltrating oxygen will destroy the coatings.
The above is a recent reply by FenEx to that exact question, I just copied it and pasted it here; he has done in depth research on spacer systems.
You may want to try Simontonâ€™s website www.simonton.com
click on homeowner then dealer locator enter your zip code and see if an Impressions dealer serves your area. You may be able to get the 9800 with SS for the same number that Depot gave you for the 6500.