As long as you dont plan to be sitting in the back seat, and you body is of a normal proportions for people of your size of weight (5'11'' / less than/near 300lbs), you should be just fine in the 7th gen Celica.
Something else to conciser, is that the stock Celica seat belt has a bit of extra distance, but probably the same amount on as which most other Toyota's have. I've found the seat belt cord in Honda to be a bit short.
But if you fit well is most other Toyota cars of the same years (2000-2005), you should be just fine. Again though, only you will be able to judge which works out best for you.
A MR2 Spider, you probably wont fit in to very well. I'm a bit taller than you, and of substantially less weight, and cannot fit in to one very well.