The $11,800 430hp price AND the last 480hp ones actually include a Magnum, not a Super Magnum. I called Pace to verify this. Typo.
The middle one has the rebate offering, and again the main difference with the Super is the 40 tooth reluctor that'd help your speedometer situation and integrate with the GM harness.
For the extra $$$ of the Super Magnum, that choice is up to you
MSRP on the Super Magnum is $4516 (Pace sells for $3878)
MSRP on the regular Magnum is $2995. So that's where most of the price difference is.
-Dale