I have both an 32 & 33 sedan and two kids, take it from me the 32 is only easier to get in and out of it has no more room than a coupe. The 33 sedan on the other hand seems to have a bit more head room than the coupe.
Fitting 18 x 9 to an R32 sedan would be difficult, tried 17x9s +40 with 245/40 had no hope, way to much hanging out so much that +45 offset wouldn't help and would probably make fronts rub on struts and rear would be so close to not clearing them aswell..