I think it depends on what your priority is and what has been done to the 2 cars.
At 100k, the GT is due for timing maintenence. At 168k, I would hope the timing belt was changed at 100k, but will be due again at 200k.
How many years/miles do you want to get out of the car? Personally I couldnt' justify selling my 220k vehicle for the same year with 160k and a $2k premium. The options are nice, but when were talking this many miles and year of a car, they shouldn't be that big of a deciding factor.
Why are you selling your car? Does it need maintenence and you don't want to sink the money into it? IMO, I'd keep yours and put the money you intended on spending on this car into a savings account. If you were going to get a loan, start transferring that much each month, then see how comfortable you are with those payments in 6 months. Then you can put a down payment on a newer/lower mileage car.
I've had plenty of high mile cars, and bought plenty too, but I have never sold a high mileage car just to buy another high mileage car.
If it's already on it's last leg and you're selling it to avoid it blowing up.. go for the GT. 100k on a 14yr old car is LOW and if it's in good shape, odds are the previous owner took good care of it. Just be sure to get the timing belt changed immediately if it hasn't been done yet.
Disregard SubiOBs post. Some of us have to start off with cheap used cars so we can pay our own debts and get ahead. If you've never had to buy a used car, then mommy and daddy started you out pretty well. Nothing wrong with that, but one should be aware that not everyone has that luxury.