I have 225/50/16 up front and 245/45/16's out back on stock sawblades. The 45 series on the rear keeps the diameter closer than the 50's. You have to remember that the '50' isnt a static measurement but a percentage of the width. So a 245/45 sidewall is very close to a 225/50 sidewall. They don't look too big at all on the back. They look pretty much the same except of course the width. I'll try to remember to get some pics (only have cam phone now, so they won't be great) when I get home from work. My tires are Yokohama EVS100's.
I run Goodyear Eagle F1 GS-D3 245-50/16 no rubbing and they stick like glue wet or dry. I like this size since it sucks the sidewall in where it belongs and not like all the youngsters run today with the sidewalls totally exposed to anything you run over. That just dont make good common tire sense. It also keeps the rims from getting chewed up by curbs etc.
I found my dunlop sp sport 5000 245's to be just as responsive as my old 225 pirellies.. and it holds to the road much better in turns. The only thing is that you cant feel the road as much, but still just as responsive as the pirelli tires. The only thing that would make it worse is mabye 255's because of the large wall but i dought it.