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I've been looking into these models as well although I think the new Charger model due out in a couple months will be the likley choice (same car, Dodge version).
The cylinder deactivation is said to be seamless and I have yet to read or hear of anyone stating that they can feel it happening. From what I understand, it's done by deactivating the lifters. Two questions I haven't found an answer for: How they overcome the drag of running the piston in a sealed cylinder, surely the valves are left partialy open; Does the deactivation alternate between (sets of) cylinders, it would almost have to or the 4 that run always would surely wear more. The system was desinged into the engine from the start, so it's not an add-on.
The Magnum is supposed to be a tick quicker than the 300, probably slightly lighter; and has a more sport tuned suspension as opposed to the 300's soft-ride tune.
The Rear suspension is directly from the mid-sized M-B models but mfg. with steel rather thal aluminum components. Don't know if the front susp. is also taken from the same model or not.
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