there are some rims on the market that has the same width as your original rim, but they're a bit much as well...
i think the original 14" rim has a 5.5" width... so if you bump up to a 16" diameter, and staying "thin", it's going to cost more, but i see them starting to make it for a few customers that want to keep the same width...
http://www.performanceplustire.com/p...urerID%5B%5D=1
and as curtis said, the tire choice & cost will also go up