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Personal choice. Prices from $1400 to $1900 w/cats and X pipe, most are stainless steel. Choice of 1 3/4" or 1 7/8", choice of X pipes, choice of cat back (an extra $180 to $1400) to put behind the header system.
Install time appears about the same on all the systems, I've seen prices from $300 to $600 for the install of the heaaders and $50 to $150 for the catback.
Looks like you could spend as much as $4,000 for a system including installation or as little as $1700 for a system if you do it yourself.