I would love to have the Studio-Pre modelled too (Original, no Mods). Yeah, it's based on the Mark series, but it has his own flavor, it's not a IIC (or IIC+) in a rack format.
The perfect example is the Triaxis LD2 Yellow vs the Original IIC+ head. Both are IIC+ circuits, but they have their distinct tone and I love both.
I always put the same example, we have a lot of Plexi style amps... They sound similar but not the same way, it's the same with Boogies. So why everytime someone wants a new Boogie modelled people always say that we have X or Y model that can cope that tone? Yeah, you can get a similar tone with other model but not the same. lt's the same way with plexis... You can get a similar tone with different Plexi models but it's not the same, it's in the Ball-Park.
We have a Diezel Blue and Silver Plate. That's the SAME amp (a VH4) and I'm pretty sure that you can get a similar tone of each other tweaking the Advanced parameters.
We have a Friedman BE/HBE, both based on the SAME amp (BE-100 / Marsha). One darker than the other, but same example, with some tweaking we can get similar tone of each other.
...And on and on.
The point is that I'm always up for new models, that being Boogies, Marshalls, Fenders or whatever. I would never say we have enough X style amps.