just add the upgrade package and convenience pkg to get very close to the basic TT price.
realistically, you should shoot for a price as close to dealer invoice (which i believe for most TT depending on dealer added options is about 32500) that you can get. your mentioned accessories are about $600. I would skip the exhaust tip as that gets easily crunched if you intend to do any medium type offroading.
The carpeted floor mats are nice, but ive already taken them out since they just get full of mud, dirt, rain, more mud. easier to clean up the plastic floor or get all around weather mats. Hitch and armrest and good to get and can be done DIY after the fact if you want to buy it cheaper afterwards.
I found one with the following options:
Carpeted Floor Mats
I went to Truecar but could not enter the TT option package?? What is a good price to pay for a 13 TT with these options? TIA!