Next week I'll be getting a check for a decent amount of money.
I have an '05 GT with a manual that is as of now bone stock.
I have two questions.
1) I currently have 245's on the back and 235's on the front. Can I fit a larger tire on the back and put the 245's in front? should i just go with 245's on the front? while the rears are brand new, I need to buy new front tires.

2) If i were to spend, say, $1500 on performance for the car, what should I buy and where should I get the work done?

I am open to anything, please help me out.
Thanks.