You're over-thinking this as only an engineer can do
The only real decision factors are if you want hand-grips , thumb rest (aka thumb breakers) and diameter - aside from that, it's just a matter of asthetics unless you have a clearance issue (which I don't think you have given your relocated seat position). The only other consideration is the amount of "dish" you want - the OE wheel has a surprising amount of offset but this is usually compensated by using a flat wheel and a hub adapter (which you'll use regardless of the dish in the wheel). I had an older version of the Veloce in the Truckette (deep dish) and with the adapter, the offset was significant enough that I had to take my hands off the wheel to actuate the signals and wipers. That's not necessarily a bad thing though as I can say that I never accidentally turned either on while driving in a "spirited" manner - of course I never drive in that manner but that's another story.
Of the Sparco line-up, I like the 383 Competition b/c it has expanded grips at the "incorrect" positions of 9 and 3. If you don't care for the hand grips, the 333 Competition is similar - both are 330mm diameter. I think I have a Lap2 (discontinued colour) in the MR2 and it makes a world of difference compared to the miserable Grant wheel it had when I purchased it.