GST tires

hello,

I own a '97 GST, and was curious as to what size tires the stock wheels take, and what size, dimensions, and brand tires anyone would personally suggest for Winter (i need traction badly), for Spring/Summer/Autumn (performance) and what type of tires you would suggest for drag racing, my uncle is dying to get me out to the track this summer. 

as for my wheels, i believe i have the stock 17" rims, i am looking to get a set of 4 18" Falken Torque 5's and a set of 4 R1 Racing GTR-14's, both for summer use, retaining the stock 17" rims for winter driving.  any suggestions?