Hi Hybrid
I've got the same car, same year, and i have just changed my rears(goodyear f1's). i was also looking for something wider due to the lack of traction and was told not to go any wider on the existing rims because the rims on 96 models are 7.5 inc wide all round, hence should'nt go larger than 235's on the tyres, therefore i kept with the 235's.
However, the 98 model has 7.5wide rims at the front with 225 wide rubber, and 8.5 wide rims at back with 245 rubber. good luck if you can find two of these cheap!
At the same time, my alloys are corroded quite badly, so am thinking of changing the alloys altogether for Toora alloys (8 inc wide), and run the same tyre profiles as the 98 model.
Hope this helped
Ket