I have a few choices I was thinking:

wheels=18x7or18x8 (most likely 18x8)

tires=215/40/18zr Front
225/35/18zr Back (if rubbing occurs then spacers will be added)

Tires=225/35/18zr all 4 (with spacers if needed)

Given we haven't test fit these size best to see what other Neon owners have done by going Neon specific sites such as Neon on section of this site, www.neons.org etc.