It all depends on how much performance you want. Stock alloy wheels just 6 inches wide for 1994 (and 5.5 for the year before). Lots of folks change to 15x8, spreading the tire and giving the sidewalls more support gives MUCH more performance from the tire but the tradeoff is ride comfort. So, what's the goal of considering the wheels? Is it looks, performance, other factors? And how much performance do you want?
Assuming you have the stock 14x6 wheels those are nice and light but tire selection is not great now for the 14 inch wheels and performance and tire choice would be improved with 15 inch. Nonetheless, if the wife only cares about comfort then stay with those 14 inch wheels. If the wife is not racing and doesn't care much about ultimate performance but you want the 15 inch look and a little more performance then I think 15x7.5 is still a bit wider than you need and I would look to our 15x6.5 choices and perhaps 15x7. Lots of good light strong choices in those sizes like our Konig Heliums, Advanti Storms, and that will still be a big jump in performance but still ride good.
For example, below are Advanti Storms in Hyper Silver color and 15x7.
And below are our classic Konig Heliums, 15x6.5