Wheel/Tire Dillema on my 69 Camaro

[Nutsy]

Please tell me what you would do. I have a 69 Camaro with DSE Tubs (not yet installed), and DSE Quadra link rear. I am fighting with myself about what rear rims/tires to run. Here is what i am looking at:

19x12 On the back with 345/30/19

Pros: Killer Looks, Killer stance, Rims that i want are available in 19x12
Cons: Michelin is the only people making a tire of that size, may require a bit more modification to clear properly

or...

18x12 on the back with 335/30/18

Pros: Plethora of tire choice
Cons: The rims i want aren't available in that size. Either would have to be modified or new rims chosen. Rims/Wheels may not fill the well the way i like and look too much like a donuts.

or...

Any idea's?

Trev