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Here's something that might help you out.... http://temp.corvetteforum.net/c5/groovyjay//wheels.html
Its from groovyjays website, 20" wheels are about as big as i've seen. That a little bit too much wheel for me, but to each his own.
Let us know what you end up with
Yeah, I'd say 20" is probably the biggest you could go for wheel size. Probably anything larger than about a 295mm would require flares...wait I recall a couple guys running widths in the low 300s though, but man, that's a big tire!