Jeff, a thought occured to me about buying replacement shocks. That's what I did.
The replacements have different valving, or it seems that way to me. I believe that they are softer than what the OE's were. I rarely ever remember using the perf setting with my OE ones; that setting was way too stiff for the street, made my eyeballs shake.
Now with 4 replacements I find that the perf setting can be used on the street without blurred vision from vibration. The tour & sport settings are softer than they used to be.
Let me explain it like this. Ya know if you're on a busy interstate and you wanna just get thru traffic, not even that ya need to be at tripples but just up say around 80+ to < 100? I like to feel the chassis stuck dead level during the lane changes, gradual ones. The OE sport setting used to be the ticket. Now with the new 4 shocks, the sport setting in that environment starts to run out of control at 90, chassis starts to become unsettled. If I go to perf the control returns to the chassis. I'm not trying to tell ya what ya gotta do. I just want to be forth right as you said you might buy two new & have two rebuilt. IMHO, if the valving on the replacement shocks is different than what came with the OE shocks on our 90's, then it might pay to match the new replacement valving with any rebuilt valving????
Tom