Kolvski, driving in Australia is a lot different than driving here in the "States". Well it is according to my Wife (who lived there) and all those "Mad Max" movies. So I don't know if your average "American" Crossfire driver can answer your question.
Since you have owned a SRT before, you know all about them, I guess it simply boils down to one question, Viper-like acceleration.
How important is that to you? I notice in your avatar that you own a "Crotch Rocket", so it must mean something. But does your scooter satisfy your need for speed enough to warrant having a much more sedate performing sports car? Only you can answer that one.
If you're not into "Drag Racing" at the track, or the "Stop Lights", I'd say keep the Limited. Better fuel mileage, less mechanical issues to deal with.
The 30 mph greater top end is really irrelevent. I mean what's the difference if your doing 150 or 180. The bugs smashed on your windshield, and the Roos splattered on your bumper and hood are still going to look the same. Besides, you can't get a SRT in red.