I would suggest using Dynamat Extreme and then installing a layer of 1/4" thick Dynaliner. I did this to mine and it was worth every penny. In my opinion, installing the Dynaliner on to of the Dynamat made a bigger difference then installing the Dynamat on the metal. My car has zero rattles, no road noise and is quite pleasant inside, especially with the windows up.
Once you've got the sound deadener down, I'd suggest making some panels to fill in the "voids" in the floor and level things out a bit...that'll make your life easier with regards to the carpet. I made some filler pieces to go around my subframe connectors to flatten things out and I'm glad I did, has a much tidier look. Just my $.02!
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