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If you want a smoother, more luxurious feel, and plan on keeping the car pretty much stock, the 2.8 is a great car.
The big question here though is whether you would be happy with the stock suspension on the 2.8. I consider the Audi Sport Suspension to be a baseline minimum for me - I could not live with the floatiness of the stock suspension. So, if I got the 2.8, a set of aftermarket shocks and springs would be a must.
Consider these things carefully, but if you really had your heart set on a 1.8T, find a way to wait the extra couple weeks. After all, why pay extra for stuff you really don't want or need.
Having said that, I love my 2.8, but the "extras" were important to me.
Good luck - Rog
I'd wait for your 1.8, and rent. a couple of hundred now is less than a thousand + over time.
my $0.02



