Don't get it.
Yes it's fast but thats all it is.
I drove a 2003 C32 AMG.It's by far the most uncomfortable car I have ever driven PERIOD.
The seats are ROCK HARD,there is absolutly no head or legroom and the backseat is straight up unusable. Seriously,my friends Kia Rio is more comfortable at least you don't feel as if you are sitting on a fucking wood bench.
Mercedes also will cost you an arm and a leg to maintain and repair.
I don't understand why you would pay 15-20 thousand for this old POS.
Out of those cars you mentioned the Altima will be the cheapest to operate and the most reliable and they are pretty quick the only downside is FWD,same deal with the TL.
The G is an okay car.
If you still want AMG like performance look for a Lexus IS350.Good car
Whatever you do don't get the C32 it is the most unpractical 4 door ever.A 350Z would be more practical.