Which is the most desireable? I'm going to replace it this weekend but I want to make sure I get the best of the bunch.
Am I looking for one out of a WS6 or Iroc?

Partsamerica lists them as for an 85 Trans Am
w/o performance suspension $192.99 ($35 core)
w/ performance suspension $152.99 ($12 core)
w/o sports suspension $154.49 ($35 core)
w Sports suspension FE2, F41 $199.99 ($75.00 core)

Just looking price wise I'm confused. Doesn't seem to make sense
Should I get one from a different year/model?

 

I think the most expensive one is the faster steering box one. I'm not 100% sure...but if anything its gonna be atleast the ones with the performance suspension system. I dont think all IROCS and WS6's came with the faster steering box...I think majority did but I dont htink all...

 

The "F41" designation was Chevy's answer to Pontiac's WS6 suspension, their highest performing susp. option.

That's the tightest, and best steering box you have listed. Of course, it's also the most expensive one too !

Hope this helps...