Welcome to the forum!
2LT and 3LT is basically worth it depending on the color scheme you are wanting to go with. If you choose black, you would be paying the extra $4k just for an upgraded material that in my opinion is not worth $4k; the wing support, I would have to sit inside the car to see if it is worth it. Since you want adrenaline red, you may be better off by getting the 3LT; with the 2LT you dont get any red on the dash and that just doesnt look right to me. If you get the 3LT you can add the microfiber upper portion which makes it look nicer.
The differences between the roofs is that one is just the carbon fiber by itself and the other one has the carbon fiber one and a dual glass one as well (you would get 2 roofs that you can swap depending on your mood I guess haha).
If you are putting a TT kit. Do not pay for the NPP exhaust. You will need a whole new exhaust system to handle the possible 700+ RWHP you will be getting out of it. So, it would be just throwing $1k in the air. The stock exhaust will not be able to handle the TT's for long. So, just wait and see what your options are. I would hold on the TT as well for a year or so and see what comes out. There is enough uncertainty with thos being the first year that the car is in production.
Consider getting jet black interior 2LT with competition seats and microfiber seat inserts no NPP. That may be more suitable for someone wanting to run TT's and the extra money you save for a new set of wheels and tires and the whole TT kit along with the exhaust. The 285's you have in the back will not be enough to get traction off the hole with TT's. You could also benefit of wider tires by being able to reduce braking times. The car does 60 mph to zero braking in 107 ft but because of the tires. With a similar set as the Z06 it would be under 100 ft.