I think the American Racing Salt Flat rims would look really good on that car, but they run about $330 each.

These are 17" steel wheels under $200 each. With primer, ready to paint. Paint it white, put a baby moon cap on it and go. http://www.summitracing.com/parts/wvi-14-7712458/overview/
17x7 4.625 in backspacing, should fit your car fine.

225/60-17 are plentiful, fit on a 7" wheel, and are 27.6" tall (about same height as current tire). They have plenty of sidewall and would look good on the wagon. If you want a little less sidewall, the 225s are available in 55, 50, and 45 series.

Do you know the current wheel size and backspacing?

Michael
Plano, Tx