Sounds good except for the gt emblems. Be proud of the V6, besides if you think its bad because you have "just a v6" see what it will be like if you put GT on the side of it

. I want to do the gt fenders aswell but I think putting gt on the side of a v6 is being very poser-ish. just make the v6 look better than their gt's and have fun with it. now dont get me wrong I am a newbie to in fact i am still a month away from getting my
stang but I just see it as a pride thing, and the pony emblem looks better than the GT personally

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Maybe a 4.0 badge would be a better idea but its your choice. But best of luck the gt kits are really cheap online.
As far as first mod, I would say your exhaust, it will give a new fell to the car and just cut the stock bumper. see how you like it then go to the gt fenders.