Robuilt,
check this doc for finding alternative sizes, from page 10 on.
http://www.bridgestone.eu/English/Global/F...oneDatabook.pdfRemember, larger rim diameter means lower comfort and harder suspension, but allows more sporty driving. I got 217/55 R17 and it's quite hard on low quality roads.
Adding tyre width means higher fuel consumption and higher risk for aquaplanning. But gives better grip on dry Texas roads.
Check your local law / approved tyre size limits for your car as well. But I think in US nobody cares about tyres.