1) Koni- Excellent for racing applications- overpriced for street applications
2) Tokico, QA1 & Bilstein- A very good shock for street/strip applications. If you are running very stiff tires on the street (such as Bridgstone or tires with profiles shorter than 50 series), these provide the extra give that you need for both comfort & stability
3) KYB- A very good shock for street/strip applications. If you are running a softer tires on the street (such as BFG or tires with profiles not shorter than 50 series), these provide the extra stiffness that you need for both comfort & stability. The Exel-G’s (formerly GR-2) are the equivalent to the Edelbrock IAS automatic adjusting units. Overall, stiffness between the Gas-a-just and the GR2’s are the same, the difference is the GR-2's valving which stiffens things up from a oem setting to that of the Gas-a-just units.
4) Gabriel- A very nice good quality HD OEM replacement type unit.
Sounds like KYB might be the choice here. I'm leary of Monroes and the big brands that these parts stores carry. So I felt I needed to ask about shocks since I'm not that well versed on these components.
The Expy has 20" wheels with 55 series BFG's, so I think a KYB shock should be a good selection based on your analysis.
Thanks and feel free to provide more info and analysis. Good stuff