The perfect solution to your concerns is the 9500ci, a bit expensive but would be a perfect fit (Redline/9500ix in a remote unit).
As for Redline vs 9500ix they both have there own advantages like you mentioned. For me if the choice had to be one it would be he 9500ix, the features coupled with its above average sensitivity is very good, and its very well rounded. However the Redline is definitely more sensitive, but that's it.
Try them both for 30 days and decide for your self.
My guess is the Redline will be a better fit for a Mustang owner, unless its a V6 (which the GT's are not).

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